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   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.

   There are no immediate reports of damage after four earthquakes rattled central Oklahoma overnight.

   The U.S. Geological Survey reports that an earthquake and a series of aftershocks began about 1:45 a.m. Central Time with a magnitude 3.0 quake centered about 3 miles west-southwest of Chandler, Oklahoma.  

   That was followed a few minutes later by a magnitude 4.3 quake near Oklahoma City. US Geological Service puts the epicenter of the quake 7 miles east-northeast of Luther, Oklahoma, and about 29 miles east-northeast of Oklahoma City.  

   At 2:15 a.m. the ground shook again.  This time a 2.8 magnitude quake struck about 54 miles east of the capital, followed a minute later by a 3.3 magnitude temblor about 4 miles east of Luther.  

   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.