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'New attack' on key Nigerian city 'New Boko Haram attack' on Nigerian city of Maiduguri
(35 minutes later)
Boko Haram Islamist militants launch fresh assault on strategic Nigerian city of Maiduguri, eyewitnesses say Boko Haram Islamist militants have launched a fresh assault on the strategically important Nigerian city of Maiduguri, eyewitnesses say.
This breaking news story is being updated and more details will be published shortly. Please refresh the page for the fullest version. Gunfire was reported on the streets of the northern city after an attack that began in the early hours of Sunday.
If you want to receive Breaking News alerts via email, or on a smartphone or tablet via the BBC News App then details on how to do so are available on this help page. You can also follow @BBCBreaking on Twitter to get the latest alerts. It comes a week after Boko Haram's last attempt to take the city was repelled by the Nigerian army.
Boko Haram began guerrilla operations in 2009 to create an Islamic state.
Thousands of people have been killed throughout the insurgency, mostly in the north-east.
Residents in Maiduguri told the AFP news agency that the attack began at 03:00 (02:00 GMT) and that heavy fighting is taking place on the southern edge of the city between insurgents and troops supported by vigilantes.
"The whole city is in fear," resident Adam Krenuwa was quoted as saying. "People are afraid of what will happen if Boko Haram defeats the security forces."
The Nigerian Premium Times newspaper reported that heavy artillery could be heard in Maiduguri as the militants attacked the city from four directions.
Boko Haram's last attempt to take over Maiduguri a week ago was stopped by the military.
But the militants did succeed in capturing the town of Monguno - 125km (80 miles) outside the city and took over a military base.
With the insurgents gaining more and more territory Maiduguri - home to tens of thousands of people who have fled their homes because of the conflict - has been increasingly vulnerable.
Experts say that the rebels are stepping up their attacks ahead of elections in Nigeria on 14 February.