Malian  soldiers backed by French fighter jets battled Islamist rebels in Timbuktu on  Sunday after insurgents used a car bomb as cover to infiltrate the northern  desert town, sources said.
The  French-led offensive in Mali has pushed a mix of Islamists out of their  northern strongholds and remote mountain bases but the militants have hit back  with several suicide attacks and guerilla-style raids.
At  least one Malian soldier was killed and four injured in Sunday's fighting in  the ancient Saharan trading hub 1,000 km (600 miles) north of the capital  Bamako, according to a Mali government communique issued on Sunday evening.
It  said that 21 Islamist rebels were also killed.
"It  started after a suicide car bombing around 2200, that served to distract the  military and allow a group of jihadists to infiltrate the city by night,"  said Mali army Captain Modibo Naman Traore.
Bilal  Toure, a member of Timbuktu's crisis committee set up after the town was  recaptured from Islamist control in January, said he saw a French plane firing  on the rebel positions. He said fighting had died down since nightfall.
"The  situation settled down after around 1900 but everyone is still staying  indoors," he said.
The  attack reflected the challenge of securing Mali as France prepares to reduce  its troop presence and hand over to the ill-equipped Malian army and a more  than 7,000-strong regional African force.
Mali's  defense ministry said on Saturday that two Nigerian soldiers in the regional  African force were killed when their convoy struck a mine outside Ansongo, near  the Niger border.
France  launched its intervention in Mali in January to halt an advance by northern al  Qaeda-linked rebels towards Bamako.
President  Francois Hollande said on Thursday that France will reduce its troop numbers in  Mali to 2,000 by July and to 1,000 by the end of the year, down from 4,000 at  present.
The  West African former colony is to hold presidential and legislative elections in  July - vital steps to stabilizing the gold- and cotton-producer after a  military coup a year ago paved the way for the northern rebel takeover.
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