Tougher gun buying lawsBLACKSBURG, Virginia — Virginia’s governor said yesterday he may be able to close the loophole that allowed a mentally ill Seung-Hui Cho to buy the guns he used to kill 33 people at Virginia Tech. — Page 15Nine US soldiers killedBAGHDAD — A suicide car bomber killed nine US soldiers at a military base north of Baghdad on Monday in the deadliest single attack against American ground forces in more than a year. — Page 16