Taliban suicide bombers attacked a NATO convoy and an office of Afghanistan's spy agency on Tuesday in Kabul.

In the first attack, a suicide car bomber slammed into a vehicle carrying NATO troops in Kabul, injuring at least two people, according to Voice of America. The incident took place in the Shah Shahid area in east part of Afghan capital.

"Three suicide bombers were involved in the attack. One detonated his explosives, two were shot dead by security forces. A foreigner and a civilian were wounded," Kabul police spokesman Ebadullah Karimi said, according to Reuters.

U.S. Army Col. Brian Tribus, a spokesman for the NATO-led Resolute Support mission in Afghanistan, confirmed the attack but said no coalition forces were killed, CNN reported.  

The attack is the second conducted by the Taliban on NATO troops convoy within a week, as one civilian was killed and twelve others were wounded in a similar attack on foreign forces in Kabul on June 30, according to Khama Press.

In the second attack, Talibani militants raided an office of Afghanistan's intelligence agency, killing one security guard and injuring another person, BBC News reported.

The Taliban militant group claimed responsibility for both attacks.

The twin Kabul attacks came at a time when first formal peace negotiations took place between official delegations of the High Peace Council (HPC) of Afghanistan and the Afghan Taliban movement in Pakistani capital Islamabad on Tuesday night.

"Whilst the government of Afghanistan welcomes the official beginning of negotiations for the first time, affirms their decisions and considers it the first step toward reaching peace, it hopes the negotiations begin a process to avert further bloodshed of innocent Afghans and destruction of the country, and pave the way for reaching durable peace," the Afghan Ministry of Foreign Affairs said in a statement on Wednesday, according to Pajhwok news agency.