Boston bombing and manhunt hold TV viewers attention all week

The fatal bombings at the finish line of the Boston marathon and ensuing manhunt have riveted TV viewers. Nearly 11 million people tuned in to NBC's evening newscast on Monday - the day two bombs went off near the finish line of the race, killing three and injuring more than 100. That preliminary Nielsen stat is 2.3 million viewers ahead of NBC's newscast results for the previous Monday.