CALAIS, France (AP) — French authorities say a migrant was killed trying to cross the Channel during a night of repeated attempts to reach England.

Natacha Bouchart, mayor of Calais, said a groups of at least 150 migrants tried repeatedly overnight to reach the Eurotunnel. She offered no details about the death.

Bouchart told France Info radio on Wednesday that migrants are trying to reach England from France "at all costs" — first crossing a busy highway and then trying to stow away on trucks in line to board the train. She says Britain, France and the Eurotunnel need to work together on the issue.

Attempts among the thousands of migrants camped in Calais to reach England have intensified with labor strife in the port city.