Islamabad, Pakistan (CNN) -- The Pakistani Taliban claimed responsibility Friday for the back-to-back bombings in the country's northwest that killed seven people, a senior Taliban leader said in a phone call to CNN.
Thursday's attacks were revenge for U.S. drone strikes in Pakistan and Pakistani military operations, according to Taliban commander Umar Khalid.
A teenage suicide bomber blew herself up Thursday at a police checkpoint in the northwest Pakistani city of Peshawar, following by a few minutes a blast targeting a police truck a few blocks away, authorities said.
During the past few years, northwest Pakistan has been repeatedly hit by bombings but suicide attacks carried out by women are rare.
The first blast occurred when a truck carrying about 20 policeman passed by, said Hukam Khan, a senior official with the city's bomb disposal squad. The bomb was planted on a parked fruit cart and remotely detonated, he said.
That blast killed a child and five police officers, said security officials in Peshawar. It wounded 32 others.
Shortly afterward, the female suicide bomber first tossed a grenade at a police checkpoint -- then detonated her vest, said police official Shafqaat Malak.
The attack killed a passer-by and wounded three others, police said.
Police said the casualties in the second blast were low because the attacker's suicide vest may have malfunctioned, setting off only a portion of her explosives.
Peshawar is the capital of Pakistan's northwest province of Khyber Pakhtunkhwa, where insurgents have routinely targeted police and security forces.
In December 2010, a teenage female suicide bomber killed more than 40 people and injured more than 100 others at a food distribution point in Pakistan's tribal region.
Journalist Nasir Habib also contributed to this report.
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