A boat with 50 migrants sinks in waters off northern France and some are in critical condition

A boat sank off France’s northern coast and plunged more than 50 migrants into the waters of the English Channel as they tried to cross it on Tuesday, and French maritime authorities said around a dozen people were recovered in critical condition.

The English Channel is a busy and often treacherous waterway. At least 30 migrants have died or gone missing while trying to cross to the UK this year, according to the International Organization for Migration. The prefecture said the boat got into difficulty off Gris-Nez point and everyone aboard ended up in the water.

Boats and aircraft were scrambled for the rescue operation and more than 50 people were picked up, the prefecture said. It had no other immediate information about injuries. Medical teams were rushed to the scene and a first aid post was set up in the fishing port of Boulogne-sur-Mer, the prefecture said. Sea temperatures off northern France were around 20 degrees C, or about 68 F.

At least 2,109 migrants have tried to cross the English Channel on small boats in the past seven days, according to UK Home Office data updated Tuesday. The data includes people found in the channel or on arrival. Europe’s increasingly strict asylum rule s, growing xenophobia and hostile treatment of migrants have been pushing them north.