ATHENS, Greece — The United Nations refugee agency has voiced concern at a rise in deaths of migrants trying to reach Greece by sea in small boats from Turkey, following two fatal shipwrecks this week.

The UNHCR said in a statement Friday that 17 people have died in such accidents this month, while the total so far this year is at least 45 deaths.

Some 56,000 people have illegally entered Greece since Jan. 1, mostly by sea. That's a five-year high, and the number has already exceeded government estimates in October of some 50,000 arrivals by the year's end.

The UNHCR representative in Greece, Maria Clara Martin, said the migrant deaths “highlight the urgent need for long-term responses and safer and credible alternatives” for people fleeing conflict, persecution, violence, or human rights violations.

“Counting lives lost at sea cannot become a norm — we should not get used to it,” she said.

The U.N. agency said that this week's two fatal accidents off the eastern Aegean Sea island of Samos, which is close to the Turkish coast, saw a mother lose three of her children, while another survivor lost his wife and daughter.

Greek authorities have attributed this year's rise in migrant arrivals to conflicts in the Middle East. While there's been a surge in people attempting the long and dangerous Mediterranean Sea crossing from Libya to the southern Greek island of Crete, most migrants pay smuggling gangs to ferry them from Turkey to the eastern Aegean islands.

On Friday, the Greek coast guard said it arrested a 17-year-old Turkish youth on suspicion of having landed 16 migrants — including three children — on the eastern island of Chios.

Get the latest news and more great videos at NewsdayTV Credit: Newsday

Visit the Shamrock Christmas tree farm ... What to do with those leftovers ... Get the latest news and more great videos at NewsdayTV

Get the latest news and more great videos at NewsdayTV Credit: Newsday

Visit the Shamrock Christmas tree farm ... What to do with those leftovers ... Get the latest news and more great videos at NewsdayTV

Black Friday$1 FOR
1 YEAR
Unlimited Digital Access

ACT NOWCANCEL ANYTIME