At least five people were killed Monday when two female suicide bombers blew themselves up at a market in northeast Nigeria and Boko Haram launched a major assault on police in two state capitals.

The blasts in Maiduguri and dawn raid in Damaturu came just days after a deadly mosque attack in the northern city of Kano left at least 120 people dead and hundreds more injured.

Nigeria's embattled northeast Yobe state on Friday imposed a travel ban through the Muslim holiday weekend to guard against Boko Haram attacks, barring motorists from reaching their families for the Eid celebration.  

A message broadcast on public radio in Yobe instructed people "to remain in their towns and villages until Monday... to forestall security breaches as we celebrate the Eid" holiday.

Boko Haram fighters have surrounded the northeast Nigerian city of Maiduguri and are preparing an imminent takeover, an influential regional group claimed on Thursday, calling for military reinforcements.

"They have completely surrounded the city of Maiduguri," said the Borno Elders Forum, which is made up of retired senior civilian and military officials as well as community leaders.

Suspected Boko Haram militants on Tuesday hurled explosives in Nigeria's troubled northeastern city of Maiduguri, killing five police officers, while a separate blast killed three.

The attacks were the latest to hit the Borno state capital, which is the epicenter of Boko Haram's brutal insurgency which has killed thousands since 2009, including more than 700 this year.

Boko Haram has claimed responsibility for an attack on a key military barracks in Nigeria, in a new video obtained on Monday by Agence France Presse that warns of further bloodshed, including against civilians.

"We carried out the attacks in Maiduguri (on March 14)," said a man dressed in white, wearing black headgear and carrying an assault rifle, claiming to be the group's leader, Abubakar Shekau.

Nigeria's military on Tuesday restored the mobile phone service in the embattled city of Maiduguri, a day after a major raid by Islamists which prompted a round-the-clock ban on movements.

The phones were switched off in May when a state of emergency was declared in the area, a move the military said would help block Boko Haram from coordinating attacks in the northeastern city.

At least 25 people were killed during a Nigerian military raid after a bomb blast blamed on Islamists and many others have been reported missing, a statement from Amnesty International said Friday.

The statement referred to an incident last weekend in the northeastern city of Maiduguri, which has seen a wave of attacks attributed to an Islamist sect known as Boko Haram and where hundreds of troops have been deployed.