Two U.S. officials told ABC News that there was another attack on a U.S. base in eastern Syria Friday, following a drone strike on Thursday, but that no damage or injuries resulted from the most recent attack.

The officials said the Friday attack was from indirect fire and one of the officials confirmed it was a rocket attack.

The U.S. military conducted retaliatory airstrikes in eastern Syria on Thursday against Iranian-backed groups after a one-way explosive drone attack targeting a U.S. base in the region killed a U.S. contractor and injured six others, including five U.S. service members, the Pentagon said.

"Earlier today, a U.S. contractor was killed and five U.S. service members and one additional U.S. contractor were wounded after a one-way unmanned aerial vehicle struck a maintenance facility on a Coalition base near Hasakah in northeast Syria at approximately 1:38 p.m. local time," the Pentagon said in a statement.

Two of the wounded service members were treated on site, while the other four Americans were medically evacuated to coalition medical facilities in Iraq, officials said. A U.S. official confirmed to ABC News that both contractors were American.

U.S. intelligence assessed that the one-way attack drone that struck the base on Thursday was Iranian in origin, according to the statement. Iran has used such drones in the past in attacks on Saudi Arabia and in Yemen, but this drone technology has become more noticeable after it provided hundreds of Shahed drones to Russia that have been used in attacks against Ukrainian civilians and infrastructure targets.