(Update: The surviving suspect has been captured, and authorities now say the suspects were not involved in the 7-Eleven robbery.)
The manhunt for the surviving Boston bombing suspect is still on, but it isn't too early for cable news talking heads to speculate about whether the attack was carried out by two brothers or if they were part of a broader group.
One brother, Tamerlan Tsarnaev, 26, died last night after hours of violence that included the brothers robbing a 7-Eleven, killing an MIT police officer, severely wounding another officer, and committing a carjacking, authorities said.
Police are searching for the other brother, Dzhokhar Tsarnaev, 19. The brothers were living in Cambridge, just outside Boston, but several news outlets said they had ethnic roots in Chechnya. A man who...