MAIDUGURI, Nigeria 芒鈧珺次元官网网址� Battling multiple bombers strapped with suicide vests, Nigerian troops and civilian self-defence fighters repelled the fiercest Boko Haram extremist attack in months on the key northeastern city of Maiduguri on Friday. Nine bombers and two civilians were killed, according to witnesses, soldiers and police.

The city is the birthplace of the Islamic insurgency and the headquarters of the military campaign to halt it.

Residents awoke to mighty explosions around midnight. Three female suicide bombers blew themselves up at a truck station, detonating vehicles at Muna Garage on the city's eastern outskirts, according to police Deputy Superintendent Victor Iskukwu. Muna Garage has been attacked many times in recent months.

Two civilians died in the blasts and seven self-defence fighters were wounded, witness Ayuba Ibrahim told The Associated Press.

"Most of the trucks that were loaded with goods for export to Chad and the border communities were destroyed, along with commodities worth millions of naira," Ibrahim said.

One blast occurred as people were trying to board the trucks, said resident Isa Mamman.

The attack also targeted a military checkpoint, according to Ahmed Satomi of the Borno State Emergency Management Agency.

Soldiers later fired at gunmen on motorcycles escorting other suicide bombers, killing at least six of the bombers.

A multinational force of troops from Nigeria and its neighbours last year drove Boko Haram out of towns and villages in northeast Nigeria, but isolated attacks and suicide bombings continue.

The seven-year Islamic uprising has killed more than 20,000 people and driven 2.6 million from their homes, creating the worst humanitarian crisis on the continent with millions facing starvation.

Haruna Umar And Ismail Alfa Abdulrahim, The Associated Press