A car bombing claimed by the ISIS group killed five people, including three children, in a Kurdish-held town in northeast Syria Wednesday, an activist group said. The explosive-rigged vehicle detonated in Al-Qahtaniya, a town in Hasakeh province, said the Syrian Observatory for Human Rights, a Britain-based observatory. Hoker Arafat, a security official, said the bomb was detonated remotely in front of the town post office. "Three children were killed in the bombing because it was very close to a primary school," he said. A member of the local security forces was wounded in the attack, he added. State news agency SANA also reported the bombing, saying it killed several people, including children. ISIS claimed the attack on its Telegram channel. The militant group routinely claims attacks in northeast Syria, despite its territorial defeat earlier this year. Such attacks have included arson against wheat fields and deadly car bombs. ISIS maintains a presence in the countrys vast Badia desert, as well as in areas controlled by the Kurdish-led Syrian Democratic Forces in the countrys northeast and east. The SDF, backed by the warplanes of a US-led coalition, announced the end of ISIS self-proclaimed "caliphate" in March in the village of Baghouz, in Syrias far east. The countrys war has killed more than 370,000 people and displaced millions since it started in 2011 with the brutal repression of anti-government protests.