A coalition including Syrian Arab groups regained a swath of territory in northeastern Syria from "Islamic State" (ISIS) terrorists, a US military spokesman said Wednesday, calling it an encouraging success.

The fighters, who are from the Syrian Democratic Forces (SDF) and its Syrian Arab Coalition subgroup, regained 87 square miles (255 square kilometers) near the town of al-Hawl, US military spokesman Colonel Steve Warren said, according to AFP.

The group "conducted an attack ... driving ISIL back," Warren said by videoconference from Baghdad, using an alternate acronym for ISIS. "This is not a large tactical action," he said, but "we are encouraged by what we saw."