Pakistani Taliban denies involvement, no suspects in custody

The FBIhas served a search warrant on a home in suburban Boston in the investigationinto the Boston Marathon bombing attack. Massachusetts State Police confirmthat a search warrant related to the investigation was served Monday night inRevere, but they haven't said anything else.

Someinvestigators were seen leaving the house early this morning, carrying brownpaper bags, plastic trash bags and a duffel bag.

Authoritiessay so far no suspects have been arrested and they don't have a motive. And theFBI is appealing for any video, audio or photos taken by marathon spectators.

Two bombswent off yesterday afternoon as thousands of Boston Marathon runners had yet tocross the finish line. Three people were killed, including an 8-year-old boy.And more than 140 people were injured, with everything from ruptured eardrumsto broken bones, to severe limbs.

President Barack Obama wascareful not to use the word "terrorism" as he spoke at the WhiteHouse Monday, but an administration official says the attack is being treatedas an act of terrorism. The Pakistani Taliban said today that it had nothing todo with the attack.