Seven Iraqi policemen have been killed, and five others were injured including two civilians in a booby-trapped car blast against a police checkpoint in west Iraqi city of Ramadi on Wednesday, an Anbar police source reported. \"A booby-trapped car, driven by a suicide bomber, blew off against a police checkpoint east of the city of Ramadi, the center of west Iraq\'\'s Anbar Province, on Wednesday, killing seven policemen, wounding three others and two civilians,\" the police source told Aswat Al-Iraq News Agency. Ramadi, the center of Anbar Province, is 110 km to the west of Baghdad.