A suicide attacker blew up a bomb-laden vehicle in Kabul on Saturday, killing at least two civilians and wounding several others, an Afghan official said.
"There is interest that we've picked up from the Taliban side," US Defense Secretary Jim Mattis told reporters before landing in Kabul, saying the signs dated back several months.
The third suicide attack in the city in a fortnight comes as the Taliban face growing pressure to take up the Afghan government's recent offer of peace talks.
Afghan officials said that, in addition to the one child who was killed, 22 other civilians were injured in the attack that happened on one of the largest traffic arteries through the Afghan capital, Jalalabad Road.
A suicide car bomb targeting a foreign forces convoy rocked eastern Kabul early Friday, killing at least one civilian and injuring four in an area where many expatriates reside, the Afghan interior ministry said.
At least five militants attacked an army outpost near one of Afghanistan's main military academies on Monday and at least one soldier was killed and three wounded, a defence ministry official said.
Kabul reacted in despair and fear on Sunday, a day after a suicide bomb in the centre of the city killed and wounded more than 250 people in the worst attack seen in the Afghan capital in months.
A bomb hidden in an ambulance killed at least 95 people and wounded about 158 in the Afghan capital, Kabul, on Saturday when it blew up at a police checkpoint.
The remains of seven Ukrainian Kam Air employees murdered by Taliban gunmen were loaded onto a plane at Kabul airport on Wednesday to be repatriated, following a sombre ceremony.
Five gunmen dressed in army uniforms made their way through two checkpoints before getting in to the hilltop Hotel Intercontinental on the weekend, killing at least 20 people, including 13 foreigners.