In this Feb. 3, 2017 frame grab from video, residents inspect a house that was damaged during a Jan. 29, 2017 US raid on the tiny village of Yakla, in central Yemen.

Three Yemeni civilians were killed when a drone attacked four suspected al-Qaeda militants traveling in a vehicle in the southern part of the country, residents and a local official said on Monday.

Residents said the attack in al-Saeed area of Shabwa province on Sunday afternoon was by a United States drone, part of a campaign by President Donald Trump’s administration against Yemen’s al-Qaeda branch.

They said al-Qaeda in the Arabian Peninsula (AQAP) was known to operate in the area and had been targeted by US forces in recent months.

The vehicle was completely destroyed in the drone strike, which also hit three civilians who happened to be passing nearby, the residents and local officials said.

The United States has repeatedly attacked AQAP with aircraft and unmanned drones in what US officials say is a campaign to degrade the group’s ability to coordinate attacks abroad.

The new US administration has not yet laid out a clear policy on drone strikes, but Trump has said he would support an escalation of the fight against Islamist militant groups.

US drone strikes have become more frequent in recent weeks, with at least six reported by Reuters last month.

In late January, at least 30 people were killed in a US commando dawn raid in southern Yemen, including at least 10 women and children, in the first such military operation authorized by President Donald Trump.

The previous administration regularly used drones to attack ISIS, al-Qaeda and other militant groups in Yemen, Syria, Iraq, Pakistan and Afghanistan. Human rights groups criticize the tactic because of civilian casualties.