France's armed forces began a military intervention in Mali this afternoon to help the government there stem a push southwards by Islamist rebels who control much of the north, President Francois Hollande said.

"French forces brought their support this afternoon to Malian army units to fight against terrorist elements," Hollande told reporters in Paris. "This operation will last as long as is necessary."

Hollande added that United Nations Security Council resolutions meant France was acting in accordance with international laws.

Mali's government appealed for urgent military aid from France yesterday after Islamist fighters encroached further south, seizing the town of Konna in the centre of the country. The rebel advance caused panic among residents in the nearby towns of Mopti and Sevare, home to a military base and airport.

"We are faced with blatant aggression that is threatening Mali's very existence. France cannot accept this," Hollande said in a New Year speech to diplomats and journalists. "We will be ready to stop the terrorists' offensive if it continues."

Malta saw the arrival of a number of migrants from Mali over the past few months.