Eight soldiers were killed when a suicide bomber exploded a car at a checkpoint outside a military barracks in north-eastern Nigeria today, witnesses said.
It was the latest in a series of daily attacks blamed on Boko Haram in the city of Maiduguri.
More than 60 people have been killed by bombings and rocket-propelled grenades since Nigeria's President Muhammadu Buhari announced at his inauguration on May 29 that the command centre for the war on the Islamic extremists is moving from Abuja, the capital in central Nigeria, to the group's birthplace in Maiduguri, the capital of Borno state at the heart of the war zone.
Later, a second bomb exploded near the main market in Yola, in neighbouring Adamawa state, police and witnesses said. At least two people were killed, police Deputy Superintendent Othman Abubakar said. Hospital workers said they were treating 30 injured.
"I can see blood splattered everywhere, including my car, but I can't give any detail because we are all running," said a bread seller who identified himself only as Mr Ayuba.
In Maiduguri, the bomber exploded the car as soldiers were checking it outside Brigadier Maimalari Barracks on bustling Baga Road during the evening rush-hour, according to Bashir Malam, a fighter with a civilian defence group that works alongside the military.
Mr Malam said he counted the bodies of eight soldiers.
"The attack was so daring because the suicide bomber must have escaped several checkpoints to get to the soldiers' spot," he said.
The latest attack came on the day Mr Buhari was visiting neighbouring Chad, urging more support for a multinational force to crush Boko Haram.
Mr Buhari was welcomed warmly by Chad's President Idriss Deby, who has complained that a lack of co-operation from the previous administration was hampering the war.
Battle-hardened Chadian troops have played a leading role in driving Boko Haram from north-east Nigerian towns and villages where it had declared an Islamic caliphate.
Nigeria announced yesterday that a Nigerian general has taken over command of the multinational army from Chad, signalling the determination of former military dictator Mr Buhari to have Nigeria lead the fight against its home-grown insurgency.
The nearly six-year-old Islamic uprising has killed an estimated 13,000 people and forced 1.5 million from their homes.