The number of non-EU migrants in Calais has grown to around 15,000. Many, by their own admission, hope to make the illegal move to Britain.
Former President Nicolas Sarkozy has been hauled in for questioning, and France is suddenly in uncharted territory.
French police plan to crackdown on improvised camps as the port attracts scores of migrants hoping to smuggle themselves across to the UK.
International Monetary Fund chief Christine Lagarde has been placed under formal investigation for negligence relating to a long-running political fraud case, an unnamed source has told Reuters.
Lagarde will appeal the French magistrates' decision to place her under formal investigation, saying the allegation of negligence was unfounded, the source stated.
The inquiry into French businessman Bernard Tapie has embroiled several of former president Nicolas Sarkozy's cabinet members, including Lagarde, who was finance minister.
Tapie was awarded €403 million (£321 million) in a 2008 arbitration payment under Sarkozy's presidency to settle a dispute with the now-defunct state-owned bank Credit Lyonnais over a share sale in 1993.
France's prime minister Manuel Valls has presented the resignation of the government to the president following a row over economic policies.
A statement from Francois Hollande's office said a new government would be formed on Tuesday in line with the "direction he (the president) has defined for our country."
The news comes after two ministers publicly criticised the government's economic path over the weekend.
France has said it would like the permanent members of the UN Security Council and regional countries, including Arab states and Iran, to coordinate action against Islamic State militants.
"In our minds and we hope that it will be possible, Foreign Minister Faurent Fabius said.
The UN Security Council's five permanent members are the US, UK, France, Russia and China.
France's President Francois Hollande has said he will soon propose holding an international conference on Iraq and how to deal with the Islamic State insurgency.
France's presidential office has announced it will supply arms "in the coming hours" in response to a request from the Iraqi Kurdish community.
Nearly 52 kilos of cocaine has disappeared from police headquarters in Paris, according to reports in the French press.
Le Parisien reports that the drugs - worth an estimated £2 million - were last seen on 23 July but were reported missing on Thursday, prompting an immediate inquiry.
The cocaine had reportedly been seized during a number of raids in July, and was said by France24 to have been kept in a room with an armoured door within the headquarters in the heart of Paris.
Air France has decided to avoid eastern Ukraine air space after a Malaysian Airlines plane crashed in the area, according to Reuters.
The French airline's move comes after Lufthansa similarly stopped flying over the region with immediate effect.
The French far-right leader Marine Le Pen has addressed a rally in Paris. She told her voters to make their own choice in the May 6th presidential election runoff. The two leading candidates - Nicolas Sarkozy and François Hollande - have been competing for the votes of her supporters.
Nicolas Sarkozy has held his final campaign rally ahead of France's presidential elections.
The country goes to the polls on Sunday in the first round of voting.
The president received strong support from the crowd in Nice, as he battles to stay in his job.