A Saudi-led coalition airstrike has hit a hospital in Yemen on Monday, killing at least seven and injuring at least 13, Reuters reports.A witness said the attack on the clinic, located in the Abs district in Yemen\u0026#039;s northern Hajja province and supported by Doctors Without Borders/Médecins Sans Frontières (MSF), could not be immediately evacuated because rescue crews feared more bombings were coming as warplanes continued flying over the area.MSF confirmed the attack on Twitter but said the death and injury toll was still unclear.BREAKING: #Yemen MSF-supported hospital was hit by airstrikes at 15:45. We are assessing the situation. Number of casualties still unknown.\u0026mdash; MSF International (@MSF) August 15, 2016\r\nReuters notes:Dozens of air strikes have hit civilians in Yemen since a coalition of Arab states led by Saudi Arabia began military operations in March 2015 to restore President Abd-Rabbu Mansour Hadi to power and roll back gains by the Iran-allied Houthis.On Sunday, MSF Yemen warned on Twitter that the \u0022humanitarian situation continues to deteriorate. People\u0026#039;s access to healthcare is very limited in #Yemen.\u0022The bombing comes just as the U.S. announced a $1 billion arms sale to Saudi Arabia. Lawmakers in U.S. Congress are gearing up for an opposition campaign to stop the deal.