BAGHDAD -- Seven people were killed, and 24 others injured in a booby-trapped car explosion which occured here Saturday. The car, according to a police source, was driven by a suicide assailant into a number of Iraqi police vehicles near the National Theater. Medical source said there were five policemen and a woman amongst the dead and a number of policemen were injured too. Four civilian cars caught fire because of the explosion and other 12 vehicles were damaged.Several nearby buildings also sustained damages including the National Theater, which was hosting a conference of Iraq's civic organizations at the explosion time. The conference was being attended by senior Iraqi officials. Also, a nearby social care center was demolished in the blast.