Two dead bodies lay on the ground in a residential area in Mariupol, Ukraine, OSCE members in the background, Saturday, January 24, 2015. A crowded open-air market in Ukraine's strategically important coastal city of Mariupol came under rocket fire Saturday morning, killing at least 10 people, regional police said. Heavy fighting in the region in the autumn raised fears that Russian-backed separatist forces would try to establish a land link between Russia and Crimea. Pro-Russian separatist forces have positions within 10 kilometers (six miles) from Mariupol's eastern outskirts. (AP Photo/Sergey Vaganov)

A woman resident passes by a burning house in Mariupol, Ukraine, Saturday, January 24, 2015. (Photo by Sergey Vaganov/AP Photo)

Local residents try to clear rubbish in an apartment building damaged by a Grad missile in Vostochniy district of Mariupol, Eastern Ukraine, Sunday, January 25, 2015. (Photo by Evgeniy Maloletka/AP Photo)

Rescue workers try to pull out a piece of an exploded Grad missile outside an apartment building in Vostochniy district of Mariupol, Eastern Ukraine, Sunday, January 25, 2015. Indiscriminate rocket fire slammed into a market, schools, homes and shops Saturday in Ukraine's southeastern city of Mariupol, killing at least 30 people, authorities said. The Ukrainian president called the blitz a terrorist attack and NATO and the U.S. demanded that Russia stop supporting the rebels. (Photo by Evgeniy Maloletka/AP Photo)

People stand next to the body of a victim killed by a recent shelling of a residential sector in Mariupol, eastern Ukraine, January 24, 2015. (Photo by Nikolai Ryabchenko/Reuters)

Ukrainian servicemen stand guard on a street near the burning building after a shelling by pro-Russian rebels of a residential sector in Mariupol, eastern Ukraine, January 24, 2015. Ten people were killed in shelling by pro-Russian separatists in the east Ukrainian port city of Mariupol on Saturday, the head of the Kiev-controlled Donetsk regional police said. (Photo by Nikolai Ryabchenko/Reuters)

An ambulance of the Ukrainian forces stops along a street beside the body of a victim killed by a recent shelling of a residential sector in Mariupol, eastern Ukraine, January 24, 2015. (Photo by Nikolai Ryabchenko/Reuters)

A woman holds a placard during a rally on Independence Square in Kiev, Ukraine, Sunday, January 25, 2015 in solidarity with the victims of a rocket attack on the coastal city of Mariupol. Indiscriminate rocket fire slammed into a market, schools, homes and shops Saturday in Ukraine's southeastern city of Mariupol, killing at least 30 people, authorities said. The Ukrainian president called the blitz a terrorist attack and NATO and the U.S. demanded that Russia stops supporting the rebels. (Photo by Sergei Chuzavkov/AP Photo)

A man walks by a burned car and a piece of exploded Grad missile, outside an apartment building in Vostochniy district of Mariupol, Eastern Ukraine, Sunday, January 25, 2015. (Photo by Evgeniy Maloletka/AP Photo)

A man walks past a burnt-out vehicle after a shelling by pro-Russian rebels of a residential sector in Mariupol, eastern Ukraine, January 24, 2015. Fifteen people were killed in shelling in the east Ukrainian port city of Mariupol on Saturday, Ukraine's interior ministry said, an attack Kiev blamed on separatist rebels and the Russian military. (Photo by Reuters/Stringer)

Ukrainian servicemen guard a street, near the body of a victim killed by a recent shelling of a residential sector, in Mariupol, eastern Ukraine, January 24, 2015. At least 20 people were killed by shelling in the east Ukrainian port city of Mariupol on Saturday, regional police said, as a rebel leader said separatists were launching an offensive on the city, the news agency RIA reported. (Photo by Nikolai Ryabchenko/Reuters)

People look out of the windows of a residential block damaged by a recent shelling in Mariupol, eastern Ukraine, January 24, 2015. (Photo by Nikolai Ryabchenko/Reuters)

An injured woman lies on a bed at a hospital in Mariupol, eastern Ukraine, January 24, 2015. Pro-Russian rebels launched an offensive against the strategic port of Mariupol in eastern Ukraine on Saturday, prompting the European Union's foreign policy chief to warn of a further “grave deterioration” in EU-Russian relations. (Photo by Nikolai Ryabchenko/Reuters)

Ukrainian servicemen guard their position in the village of Luhanska, Luhansk region January 24, 2015. Eastern Ukraine has seen an escalation of fighting in recent days that Russian President Vladimir Putin has blamed on Kiev. The rebels have ruled out more peace talks. Ukrainian President Petro Poroshenko, pledging to protect Ukrainian territory, said he would convene an emergency meeting of his country's security council on Sunday. (Photo by Oleksandr Klymenko/Reuters)

People hold placards with the slogan “I am Bosse” during a mourning ceremony for victims killed in the shelling of a bus stop, in Donetsk, eastern Ukraine, January 24, 2015. (Photo by Alexander Ermochenko/Reuters)

Ukrainian servicemen stand next to an armoured personnel carrier (APC) at their position in the village of Luhanska, Luhansk region January 24, 2015. (Photo by Oleksandr Klymenko/Reuters)

A Ukrainian serviceman stands guard at his position in the village of Luhanska, Luhansk region January 24, 2015. (Photo by Oleksandr Klymenko/Reuters)

People remove debris near the building damaged by shelling on Saturday in Mariupol, eastern Ukraine, January 25, 2015. Pro-Russian rebels launched an offensive against the strategic port of Mariupol in eastern Ukraine on Saturday, prompting the European Union's foreign policy chief to warn of a further “grave deterioration” in EU-Russian relations. Mariupol's city administration said the rebels had killed at least 30 people and injured 83 others by firing rockets from long-range GRAD missile systems. (Photo by Nikolai Ryabchenko/Reuters)

A rescue worker removes remains of a shell on a street in Mariupol, eastern Ukraine January 25, 2015. (Photo by Nikolai Ryabchenko/Reuters)

People stand next to a toy store damaged by shelling on Saturday in Mariupol, eastern Ukraine January 25, 2015. (Photo by Nikolai Ryabchenko/Reuters)

Smoke and flames rise above a burning building after shelling in the eastern Ukrainian city of Mariupol, 24 January 2015. Fifteen civilian people were killed and 46 injured during a shelling at Jan.24 morning in Mariupol according to a UNIAN agency report. (Photo by Sergey Vaganov/EPA)

Local residents react as they stand near the covered body of man, who was killed during shelling in the eastern Ukrainian city of Mariupol, 24 January 2015. (Photo by Sergey Vaganov/EPA)

A Ukrainian serviceman and local residents inspect a damaged car after a shelling in the eastern Ukrainian city of Mariupol, 24 January 2015. (Photo by Sergey Vaganov/EPA)

A man walks past a Soviet hummer and sickle sculpture, outside an apartment building damaged by a Grad missile in Vostochniy district of Mariupol, Eastern Ukraine, Sunday, January 25, 2015. (Photo by Evgeniy Maloletka/AP Photo)

A piece of an exploded Grad missile is photographed outside an apartment building in Vostochniy, district of Mariupol, Eastern Ukraine, Sunday, January 25, 2015. (Photo by Evgeniy Maloletka/AP Photo)

Burned cars on a destroyed parking site in a residential area in Mariupol, Ukraine, Saturday, January 24, 2015. (Photo by Sergey Vaganov/AP Photo)

A dead body surrounded by local residents lays on the ground in a residential area in Mariupol, Ukraine, Saturday, January 24, 2015. (Photo by Sergey Vaganov/AP Photo)

Two dead bodies lay on the ground in a residential area in Mariupol, Ukraine, an OSCE member in the background right, Saturday, January 24, 2015. (Photo by Sergey Vaganov/AP Photo)

A dead body lays on the ground in a residential area in Mariupol, Ukraine, Saturday, January 24, 2015. (Photo by Sergey Vaganov/AP Photo)

In this Sunday, January 25, 2015 pool photo, Ukrainian parliament lawmaker and leader of Ukraine's Radical Party Oleh Lyashko, second left, greets Ukrainian soldiers while visiting their position near the town of Volnovakha, in eastern Ukraine. (Photo by Osman Karimov/AP Photo)

Ukrainian servicemen stand guard near a destroyed shop after shelling in the southern Ukrainian port city of Mariupol on 24, 2015. At least 27 people died Saturday in a rocket attack on Ukraine's strategic government-held port of Mariupol after Russian-backed rebels rejected peace talks, the mayor's office said. A top pro-Russian rebel on January 24 announced the launch of a major offensive on Ukraine's government-held port of Mariupol, confirming responsibility for rocket fire. (Photo by AFP Photo/Stringer)

Peole look at a burning shop after shelling in the southern Ukrainian port city of Mariupol on 24, 2015. (Photo by AFP Photo/Stringer)

Emergency medical workers provide medical care to unjured people after shelling in the southern Ukrainian port city of Mariupol on 24, 2015. (Photo by AFP Photo/Stringer)

Ukrainian servicemen patrol around a damaged building after shelling in the southern Ukrainian port city of Mariupol on 24, 2015. (Photo by AFP Photo/Stringer)