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BOSTON -- ABC News -- Authorities are close to identifying a suspect in the deadly Boston Marathon bombing, an official in Boston told ABC News.

ABC News' Boston affiliate, WCVB, reported a source had said a suspect has already been identified and an arrest is imminent. Surveillance video taken from cameras at a Lord & Taylor along the marathon route helped identify the suspect, WCVB said.

A pair of blasts erupted Monday afternoon near the finish line of the Boston Marathon, killing three people and injuring more than 170 others.

Authorities said they have been analyzing thousands of photos of the event and tracking down as many leads since the bombing. Tuesday ABC News reported part of a pressure cooker bomb had been recovered from the scene with wires, shrapnel and a circuit board. That evidence has been sent to the FBI lap in Quantico, Virginia for analysis, officials said.

   PESHAWAR, Pakistan (AP) — The Pakistani Taliban have denied any role in the bombings at the Boston Marathon that killed at least three people and injured more than 140.

   The group's spokesman, Ahsanullah Ahsan, denied involvement in a telephone call with The Associated Press on Tuesday. He spoke from an undisclosed location.

   The main focus of the Pakistani Taliban has been a bloody insurgency against the Pakistani government because of its alliance with the United States and to enforce Islamic law in the country.

   But the group has threatened attacks in the U.S. as well, and claimed responsibility for a failed car bombing in New York's Times Square in 2010.

   The Times Square attacker, Faisal Shahzad, has admitted to getting training from the Pakistani Taliban in the country's tribal region.

   MOSCOW (AP) — The organizers of the World Athletics Championship in Moscow say they will beef up security in the wake of deadly explosions at the finish line of the Boston Marathon.

   The August 10 to 18 event is seen as a dress rehearsal for the 2014 Winter Games in Russia's Black Sea resort of Sochi.

   The R-Sport news agency on Tuesday quoted Valentin Balakhnichev, president of the Russian Athletics Federation, as saying that the organizers "will draw conclusions" from the Boston bombings.

   Balakhnichev said the security standards they adhere to are high but the organizers "will take tougher measures" to ensure security.

ANKARA, Turkey (AP) - Turkey's state-run news agency says police are rounding up dozens of people suspected of membership in a left-wing militant group that has claimed responsibility for a suicide attack at the U.S. Embassy in Ankara earlier this month.

It was the second major sweep against suspected members of the Revolutionary People's Liberation Party-Front, or DHKP-C, since January. It wasn't immediately clear if the arrests were directly linked to the embassy bombing which killed a Turkish security guard on Feb. 1.

The Anadolu Agency said Tuesday police were arresting dozens of people in 28 provinces across Turkey.

The DHKP-C has claimed responsibility for assassinations and bombings since the 1970s but had been relatively quiet in recent years.