{Boko Haram insurgents have attacked a military airbase in north-eastern Nigeria, destroying two helicopters, the authorities say.}
Eyewitnesses say hundreds of militants attacked several areas of the city of Maiduguri, starting early on Monday.
A 24-hour curfew has been imposed in Maiduguri. Its civilian airport was also briefly closed.
A BBC correspondent says the large-scale, co-ordinated attack is a big setback for the Nigerian military.
Thousands of people have been killed since 2009, when Boko Haram launched its campaign to install Islamic law.
In May, a state of emergency was declared in Borno state, of which Maiduguri is the capital, as well as two neighbouring states, while there has been a massive military deployment to the worst-affected areas.
BBC
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