A man died after being crushed by a truck during an attempt to enter Britain through the Channel tunnel at Calais on Tuesday evening, according to French police.
The man, a migrant of Sudanese origin aged between 25 and 30 years old, was hit by the vehicle as it left a shuttle after crossing the tunnel.
A police spokesperson told Agence France-Presse: "Our team found a corpse this morning and the firefighters have confirmed the death of this person."
The man is one of nine migrants who have died near the Channel tunnel area while trying to enter the UK since the start of June.
At least 1,500 other attempts were made by migrants to enter the Channel tunnel on Tuesday evening, according to a spokesperson for Eurotunnel.
Police believe "between 500 and 1,000 migrants" are still around the tunnel site after the overnight mass attempt.
Romain Dufour, a spokesperson for Eurotunnel, said: "It is the highest number since migrants have started to sneak into our premises to try to jump on the trains about a month a half ago."
Eurotunnel said it has "blocked" more than 37,000 attempts by migrants, mostly from Syria, Eritrea, and Sudan, to reach Britain since January.
BuzzFeed News has attempted to get in touch with Eurotunnel for more information.
British home secretary, Theresa May, is chairing an emergency meeting on Wednesday in response to last night's events.
After a meeting with French officials on Tuesday, May said the French and UK governments are working in close collaboration to deal with the migrant crisis and are increasing security.
"We are both clear that we need to ensure we are dealing with the terrible criminal gangs, the people smugglers, who are making a profit out of the human misery of many people," she said.
Prime minister David Cameron said the UK government is investing £7 million in building security fencing at the terminal.
Speaking at a press conference in Singapore during a four-day tour of Southeast Asia, Cameron said: "We are working very closely with the French. We have invested money in the fencing around Calais, including fencing around the entrance to the tunnel."
He said the situation was "very concerning" and that he felt sympathy for British holidaymakers making their way to Calais.
The Foreign Office and the Department for Transport are advising UK travellers to consider using alternative ports.