Afghan officials said the attackers had "obviously wanted to enter the base," the largest of its kind in the country. NATO's support mission said the attack was "quickly contained and repelled."

Axar.az reports citing AniNews that a suicide attack on Wednesday injured at least five people near Bagram Air Base, the largest US military facility in Afghanistan.

Initial reports suggested the attack had targeted the military base. Afghan officials later said the attack struck a medical facility under construction near the base, triggering clashes between additional assailants and international forces.

"A 30-minute clash also happened between the attackers, who obviously wanted to enter the base, and foreign forces," Wahida Shahkar, a spokeswoman for the governor of Parwan province, told Reuters news agency.

The NATO-led mission Resolute Support said the attack was "quickly contained and repelled… but the future medical facility was badly damaged."