At least 30 people were killed and 65 others injured on Monday when twin blasts hit a mosque in Nigeria's Maiduguri, capital of the northeastern state of Borno.The bombs, suspected to have been planted in the mosque, went off twice as worshipers arrived for prayer in Sulemanti ward, located along Jiddari-Polo area of the Maiduguri city, Xinhua news agency quoted a security official as saying."They were heavy blasts, even people living in nearby houses were affected," he added.