Dozens killed in fierce clashes between Boko Haram and Nigerian troops

Boko Haram extremists attack Maiduguri, biggest city in northeast Nigeria; troops block roads leading into city, preventing civilians from escaping.

In fierce fighting Sunday, Nigerian troops clashed with Islamic extremists who attacked Maiduguri, the biggest city in northeast Nigeria. Dozens of combatants have been killed and wounded, soldiers and hospital workers said.

“Coordinated air and land operations are being conducted now,” Defense Ministry spokesman Brig. Gen. Chris Olukolade said in a message posted on Twitter.

Troops blocked roads leading into the city, which also is preventing civilians from escaping.