“The European Union's border agency is boosting its operations in the Mediterranean Sea near Greece as increasing numbers of migrants try to enter the EU from Turkey, its chief said Thursday. “We are worried about the situation in Greece and that's why we will upgrade our action there and our support to the Greek authorities”, Frontex Executive Director Fabrice Leggeri told The Associated Press in an interview. More than 10,000 people have been plucked from the central Mediterranean in recent weeks attempting to enter Europe from Libya on overcrowded, unseaworthy boats. The International Organization for Migration estimates that nearly 1,830 migrants have died crossing the Mediterranean this year compared to 207 in the same period last year. “There is a shift from the central Mediterranean to the eastern Mediterranean” as more migrants leave Turkey by sea and land, Leggeri said. “They are moving very quickly, so we have to be flexible”. Earlier Thursday, police in northern Greece said 93 Syrian migrants were released from a locked cargo train carriage after being tricked by smugglers into traveling in the wrong direction. The number of Syrians reaching Greece has surged in the past year as the civil war in their country continues into a fifth year. Many make the short hop from Turkey's southwest coast toward the island of Lesbos 9 kilometers (5 miles) away in inflatable rafts. From there, they often try to board ferries and move further north into Europe. But others choose to travel by land through western Turkey and across the Greek and Bulgarian borders, where the Frontex presence is also being stepped up”. – Lorne Cook via The Associated Press

A family of Afghan immigrants pause to look at Macedonian mountains in the distance in a field next to the Greek-Macedonian border while attempting to flee to Macedonia from the border village of Idomeni in Kilkis prefecture May 13, 2015. Hundreds of mostly Afghan, Syrian, and African immigrants cross daily from Greece into Macedonia on their way to northern European countries; most of them are turned back by Macedonian border guards. (Photo by Yannis Behrakis/Reuters)

An Afghan immigrant carries his son, followed by his wife, as they walk through a field close to the Greek-Macedonian border in an attempt to flee to Macedonia from the border village of Idomeni in Kilkis prefecture May 13, 2015. (Photo by Yannis Behrakis/Reuters)

An immigrant from Mali rests at the Greek-Macedonian border before an attempt to flee to Macedonia May 13, 2015 village of Idomeni in Kilkis prefecture May 13, 2015. (Photo by Yannis Behrakis/Reuters)

Kurdish Syrian immigrant Sahin Serko rests next to his 7 year-old daughter Ariana minutes after crossing the border into Macedonia, along with another 45 Syrian immigrants, near the Greek village of Idomeni in Kilkis prefecture May 14, 2015. (Photo by Yannis Behrakis/Reuters)

A group of Syrian immigrants run to hide from patrolling Greek police before crossing the border into Macedonia, along with another 45 Syrian immigrants, near the Greek village of Idomeni in Kilkis prefecture May 14, 2015. (Photo by Yannis Behrakis/Reuters)

A group of Syrian immigrants walk on a field towards Greece's border with Macedonia in Kilkis prefecture May 14, 2015. (Photo by Yannis Behrakis/Reuters)

Kurdish Syrian immigrant Sahin Serko holds his 7 year-old daughter Ariana as they run to hide from patrolling Greek police before crossing the border along with another 45 Syrian immigrants into Macedonia near the Greek village of Idomeni in Kilkis prefecture May 14, 2015. (Photo by Yannis Behrakis/Reuters)

A Syrian immigrant calls friends on his mobile after crossing the borderinto Macedonia, along with another 45 Syrian immigrants, near the Greek village of Idomeni in Kilkis prefecture May 14, 2015. (Photo by Yannis Behrakis/Reuters)

An Afghan immigrant family keeps warm at the Greek-Macedonian border line near the village of Idomeni in Kilkis prefecture May 14, 2015. (Photo by Yannis Behrakis/Reuters)

Syrian immigrants call friends after crossing the border, along with another 45 Syrian immigrants, into Macedonia near the Greek village of Idomeni in Kilkis prefecture May 14, 2015. (Photo by Yannis Behrakis/Reuters)

Seven year-old Ariana, a Kurdish-Syrian immigrant, drinks water next to her father Sahin Serko whille resting before crossing into Macedonia along with another 45 Syrian immigrants near the border Greek village of Idomeni in Kilkis prefecture May 14, 2015. (Photo by Yannis Behrakis/Reuters)

A group of Syrian immigrants hide as a Greek police patrol van drives on the asphalt road next to them near the border with Macedonia in Kilkis prefecture May 14, 2015. (Photo by Yannis Behrakis/Reuters)

A group of Syrian immigrants hide as they walk towards Greece's border with Macedonia in Kilkis prefecture May 14, 2015. (Photo by Yannis Behrakis/Reuters)

A group of Syrian immigrants hide as they walk towards Greece's border with Macedonia in Kilkis prefecture May 14, 2015. (Photo by Yannis Behrakis/Reuters)

A group of Syrian immigrants hide as they walk towards Greece's border with Macedonia in Kilkis prefecture May 14, 2015. (Photo by Yannis Behrakis/Reuters)

A group of Syrian immigrants hide as they walk towards Greece's border with Macedonia in Kilkis prefecture May 14, 2015. (Photo by Yannis Behrakis/Reuters)

A group of Syrian immigrants hide as they make their way towards Greece's border with Macedonia in Kilkis prefecture May 14, 2015. (Photo by Yannis Behrakis/Reuters)

A group of Syrian immigrants are silhouetted as they walk through a field towards Greece's border with Macedonia in Kilkis prefecture May 14, 2015. (Photo by Yannis Behrakis/Reuters)

A group of Syrian immigrants run on a field towards Greece's border with Macedonia in Kilkis prefecture May 14, 2015. (Photo by Yannis Behrakis/Reuters)

A group of Syrian immigrants rest at a deserted petrol station near the border with Macedonia in northern Greece May 14, 2015. (Photo by Yannis Behrakis/Reuters)

Seven year-old Ariana, a Kurdish-Syrian immigrant, rests before crossing into Macedonia along with another 45 Syrian immigrants near the border Greek village of Idomeni in Kilkis prefecture May 14, 2015. (Photo by Yannis Behrakis/Reuters)