Two people were killed and six others wounded by terrorist attacks in Iraq on Sunday, the police said. A sticky bomb attached to the car of a manager of a gas station went off, killing him and his driver, in al-Siniyah area, near the city of Baiji, some 200 km north of the capital Baghdad, a local police source told Xinhua on condition of anonymity. Also on Sunday, another sticky bomb attached to a government vehicle exploded, wounding three employees of the Iraqi Higher Education Ministry in Seliekh district in northern the capital, an Interior Ministry source anonymously told Xinhua. Meanwhile, in a separate incident, a roadside bomb went off in Karrada district in central Baghdad and wounded three people, the source said. Iraqi cities have been plagued by several attacks, including suicide bombings, since the U.S. troops pulled out of the country late last year.