The death toll from an airstrike on a prison in Yemen has risen to 23, with seven people still missing, according to Houthi rebels. Rescuers have recovered more bodies from the rubble of the prison in Hazm, the capital of Jawf province, which was hit by a deadly airstrike earlier this week. The attack has worsened the already tense situation between the Houthi rebels and a Saudi-led military coalition, raising concerns that Yemen’s fragile ceasefire may be breaking down. The prison collapsed on Monday after being struck by coalition forces, killing at least 23 people, including four whose bodies were recovered on Wednesday. It is unclear how many people were inside the prison at the time of the attack, which also left seven injured. Among those injured was a woman visiting her husband, as reported by a Houthi health ministry representative. Houthi military spokesperson Brig. Gen. Yahya Saree stated that the airstrike was carried out by a Saudi F15-SA fighter jet, which took off from King Khalid Air Base in Khamis Mushait at 4:30 p.m. on Monday, struck the prison, and returned to the base within 15 minutes. The Saudi government has not yet commented on these claims. In response, the Houthi rebels launched attacks on southern Saudi cities, prompting the coalition to retaliate with airstrikes targeting Houthi military positions in Jawf and Marib provinces. A child was among the 23 killed, according to Hassan Saboula, director of Jawf’s civil defense agency. The identities of the victims have not been officially confirmed. Yemen’s civil war began in 2014 when the Houthi rebels captured the capital, Sanaa, forcing the internationally recognized government to flee to Saudi Arabia. A Saudi-led coalition entered the conflict the following year to support the government. The war has led to at least 150,000 deaths, according to U.N. estimates, and has occasionally brought the country close to famine. Recent tensions escalated in July when the Houthi rebels tried to fly a plane from Tehran to Sanaa, defying a long-standing blockade by the coalition. The coalition responded by striking the Sanaa airport to prevent the flight. Since then, the rebels have attacked Saudi Arabia and its shipping routes in the Red Sea. On Tuesday, they targeted several Saudi oil facilities, some of which were temporarily shut down, according to the Saudi Energy Ministry. The conflict has also seen Houthi rebels attack Saudi-backed forces across multiple fronts in Yemen. However, government forces have recently gained ground, launching attacks on Houthi positions along the Red Sea. Violence in the country has already claimed at least 194 lives and injured over 880 people between August 23 and September 5, according to the World Health Organization. More than 21,000 people have been displaced due to the fighting. The recent escalation has effectively ended a four-year ceasefire that had largely stopped the fighting in the civil war.