The F.B.I. did not tell the Boston police about the 2011 warning from Russia about Tamerlan Tsarnaev, one of the two brothers accused in the Boston Marathon bombings, the city’s police chief said Thursday during the first public Congressional hearing on the terrorist attack. http://www.nytimes.com/2013/05/10/us/boston-police-werent-told-fbi-got-warning-on-tsarnaev.html  Officers worked with the F.B.I. on a Joint Terrorism Task Force, they did not know about the Russian tip or the bureau’s subsequent inquiry, which involved an interview with Mr. Tsarnaev and his parents. Officers would “absolutely” have taken a second look at Mr. Tsarnaev.