Islamabad, Pakistan (CNN) -- A suicide bomber detonated explosives at a police checkpoint in the northwest Pakistani city of Peshawar on Monday, killing at least three people, police said.
The victims were a police officer, a civilian and the driver of the rickshaw that the suicide bomber was riding, said Peshawar police official Kiramat Hussain.
At least five others were wounded in the attack on the well-known Ring Road, Hussain said.
In recent days, Peshawar -- the capital of the North West Frontier Province -- has come under increasingly frequent attacks.
On Sunday, a suicide car bomber killed 17 people, including an area mayor.
The Taliban claimed responsibility for the attack, which injured at least 28 people on the outskirts of Peshawar.
On October 28, a massive car bomb tore through the heart of a bustling marketplace in Peshawar, killing at least 100 people and injuring at least 200 others.
The attacker in Monday's blast packed about 6 kg (13 lbs) of explosives in a vest, said Shahibzada Anis Khan, the district coordination officer for Peshawar.
The bomber might have been targeting another area but blew himself up when stopped by police, Khan said.
Also Monday, a roadside bomb attack killed two members of the Frontier Corps while on patrol in Bajaur, one of seven semiautonomous tribal agencies along the Afghan border that make up the Federally Administered Tribal Areas.
A third Frontier Corps member was wounded.
The Frontier Corps is a paramilitary force that uses recruits from Pakistan's tribal areas and is overseen by Pakistani army officers.
CNN's Samson Desta and Umar Aziz Khan, and journalists Nasir Habib and Nasar Ul Islam contributed to this report.