Homeland Security Committee chairman believes Boston Marathon bombing suspects were trained

Boston hospital releases bombing patients

WASHINGTON - House Homeland Security Committee chairman Rep. Michael McCaul says he believes the Boston bombing suspects had training before the attack.

McCaul is citing the type of device used in the attack -- shrapnel-packed pressure-cooker bombs -- and the weapons' sophistication as signs of training.

Homemade bombs built from pressure cookers have been a frequent weapon of militants in Afghanistan, India and Pakistan. Al-Qaida's branch in Yemen once published an online manual on how to make one.

McCaul also tells "Fox News Sunday" that he thinks the suspects' mother played "a very strong role" in her sons' radicalization process and that if she were to return to the United States from Russia, she'd be held for questioning.

Meanwhile, a Boston hospital says the number of patients it is treating for injuries sustained in the bombing continues to drop.

Beth Israel Deaconess Medical Center spokesman Jerry Berger says that by Sunday morning, it had six patients with injuries from the bombing, down from more than 20 in the days immediately following the April 15 attack.

Berger says all six patients are in good or fair condition.

The hospital also treated 19-year-old bombing suspect Dzhohkar Tsarnaev for injuries authorities say he suffered during an attempt to elude police. Tsarnaev was moved Friday to a federal prison medical center.

In all, 26 hospitals have treated people with injuries from the bombing.