BEIRUT, Lebanon — A car bombing targeted a joint American-Kurdish patrol in Syria on Monday, injuring a number of fighters from a Kurdish-led force allied with the United States. The Islamic State claimed responsibility for the attack.

The explosion came just five days after at least 15 people, including four Americans, were killed in a suicide bombing by the Islamic State in Manbij, Syria, which is controlled and protected by American-backed local forces.

Coming only weeks after President Trump ordered American troops to withdraw from Syria, the attacks serve as a reminder that the Islamic State, while controlling just a small fraction of the territory it once had, remains capable of striking in what was considered relatively safe territory.

The Amaq News Agency, which is linked to the militant group, reported that a suicide bomber had attacked a convoy of United States troops and Syrian Democratic Forces in what it claimed as a “martyrdom-seeking attack,” wording it uses to take responsibility.