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April 21: Nightly News Sunday broadcast


Bombing suspect beginning to respond to investigators; In Russia, suspected bombers' friends, family struggle to understand; Slowly, Boston returning to normal; London Marathon celebrates Boston; Midwest battling mother nature; West, Texas gathers to pray, remember; Thrill seekers return to Colorado slope where avalanche killed five; Search is on for survivors following earthquake in China; US pledges to double aid to Syrian opposition; New scholarship for U.S. students studying in China; Bostonians take back their city