KADUNA  - Explosions rocked an army barracks, a bridge and an air base in the northern Nigerian city of Kaduna Tuesday amid a wave of attacks blamed on Islamist group Boko Haram, officials said.The military said the attack on the barracks was carried out by a suicide bomber wearing an army uniform. Troops opened fire on him before he was able to reach the compound's buildings.According to the military, the blast went off after soldiers opened fire on the car as the bomber sought to force his way onto the grounds at the barracks in Kaduna, a major city in Nigeria's mainly Muslim north."There was a suicide bombing attempt by someone dressed in military uniform, driving in a private car," army spokesman Raphael Isa told journalists."The soldiers ... repelled the attack and were able to stop what would have been a suicide bombing at the frontage of the headquarters" of the 1st Mechanised Division, the spokesman said."However after firing on the suicide bomber who tried to force his way, the bomb exploded and shattered the glass that adorns the frontage of the headquarters. The suicide bomber was the only casualty..."A military source said the bomber was killed. A rescue official and residents said a second explosion occurred near a bridge in Kaduna, while residents reported a third at an air force base near the army barracks.According to residents, the blast near the bridge damaged four commuter buses and wounded passengers, but details of the explosion at the air force base were unclear. One resident said it appeared a bomb had been planted there.Musa Ilallah, an official with the National Emergency Management Agency in Kaduna who confirmed the explosion near the bridge, said rescue workers had been deployed to affected areas but were being refused access by soldiers."From all indications, they gate-crashed into the military barracks," said Ilallah.One resident said he saw soldiers being taken out of the barracks with cuts thought to be from the shattered glass."Virtually all the glass has been shattered," the resident said. "I saw soldiers with glass cuts on their bodies being taken out, but it's difficult to say if there were any (more serious) casualties."Boko Haram has been blamed for scores of bomb attacks in northern Nigeria, including some in Kaduna.It claimed responsibility for January 20 coordinated bombings and shootings in Nigeria's second-largest city of Kano that left at least 185 people dead -- Boko Haram's deadliest attack yet. The August suicide bombing of UN headquarters in the capital Abuja which killed at least 25 people was also attributed to the group. In December, a powerful explosion rocked Kaduna, killing at least eight people, wounding many others and destroying a number of houses and shops, but the cause has never been clarified.Nigeria's military has killed eight suspected members of Islamist group Boko Haram in a raid on an alleged hideout that sparked a five-hour shootout, an army source said Tuesday. The Monday evening raid on the outskirts of Nigeria's second city of Kano was carried out as gunmen believed to be Boko Haram members bombed a police station in another city neighbourhood, where they also shot an officer in the leg."The military succeeded in killing eight gunmen, arrested five others and discovered five high-calibre bombs and 15 other low-calibre bombs. All these are homemade," said the military source, who requested anonymity.  Residents who visited the alleged Boko Haram hideout in Kano's Mariri neighbourhood told AFP that parts of the floor were blood-stained.The military source added that some members of the shadowy group escaped during the raid and that security forces found a large cache of guns and ammunition inside."The first indications are that this is an armory for the sect," he said.Security forces have faced mounting pressure to crack down on the group, which has said it wants to create an Islamic state across Nigeria's deeply impoverished, mainly Muslim north. Previous claims of raids on alleged Boko Haram hideouts have so far however done little to stop attacks attributed to the group.Boko Haram's insurgency has included both small and large-scale attacks, which have mainly targeted the police and other symbols of authority. The group has claimed assaults that have killed more than 200 people already this year, including a sophisticated series of gun and bomb attacks in Kano on January 20 that claimed at least 185 lives -- its deadliest attack yet.In the northeastern city of Maiduguri, seen as Boko Haram's base, residents reported a series of blasts at a market on Monday evening that set fire to several vehicles and shops.The military confirmed the explosions at the market but declined to give details.