The Pakistani Taliban has denied responsibility for the explosions at the Boston Marathon.
"TTP didn't carry out Boston attacks," Pakistani Taliban spokesman Ehsan Ullah Ehsan said.
New photos of the suspects identified by officials as Dzhokar A. Tsarnaev, 19 and Tamerlan Tsarnaev, 26 have been released.
The FBI has released pictures and video of two suspects in the Boston Marathon bombing, seeking the public's help.
President Obama attended a memorial service in Boston today, paying tribute to the victims of Monday's terrorist attack.