BBC News"An explosion and heavy gunfire has rocked the northern Nigerian city of Maiduguri - a stronghold of the Islamist Boko Haram group.
Its fighters threw an explosive device at a military patrol, wounding three officers, military officials said.
Soldiers then engaged in running gun battles with the militants in the centre of Maiduguri.
The BBC's Bilkisu Babangida in Maiduguri says the city is in lockdown, with residents staying indoors."
Its fighters threw an explosive device at a military patrol, wounding three officers, military officials said.
Soldiers then engaged in running gun battles with the militants in the centre of Maiduguri.
The BBC's Bilkisu Babangida in Maiduguri says the city is in lockdown, with residents staying indoors."