Croatia allowed thousand of migrants who were stuck at the border with Serbia to cross into its territory late Monday afternoon, having earlier dramatically slowed the number of crossings, an AFP photographer saw.

"Everybody who was here has gone through," said the photographer at the Berkasovo crossing, where between 2,000 and 3,000 people had been stuck waiting to cross in cold and wet conditions.

Czech volunteer Jan Pinos at the scene also told AFP that Croatian police had "opened the gate and let all refugees who where there in".