Afghan police say a suspected Taleban fighter and a woman have died in a clash in eastern Afghanistan.
A spokesman for the police chief in Nangarhar province told the BBC that Afghan security forces surrounded a house believed to be a Taleban hideout.
He said American military aircraft and Afghan ground forces were involved in the operation which is said to have lasted several hours.
There has been an increase in clashes with Taleban fighters in recent weeks.
Ghafour Lewal, spokesman for Nangarhar's police chief, said the latest clash took place in Chaprihar district, near the Tora Bora mountains close to the Pakistan border.
He said the Taleban fighters began the clash by attacking the security forces with grenades.
"We asked them to surrender through tribal elders but they refused to do so," he said.
After the clashes, security forces entered the house to find one dead militant. The rest appear to have escaped, they said.
One militant has been arrested. Two government soldiers were injured in the clash.
The BBC's Bilal Sarwary in Kabul says foreign militants, mainly Arabs, are known to have a presence in the area.
There has been no comment as yet from the US military on the incident.
Last month, a fierce battle between Taleban fighters and Afghan troops in the southern province of Helmand left 25 dead.
Last year, attacks mainly in southern and eastern Afghanistan left more than 1,400 people dead. It was the country's bloodiest year since US-led forces ousted the Taleban in late 2001.