The US embassy in Sana'a said on Wednesday morning, September 17, at

 approximately 9:15 local time, the Embassy compound was attacked by armed terrorists.
A number of explosions occurred in the vicinity of the Embassy's main gate and there were several secondary explosions. A number of Yemeni security personnel were killed and injured, as were several Yemeni citizens waiting to gain entry to the Embassy.
The U.S. Embassy condemns this attack in the strongest possible terms. Today's events demonstrate that terrorist criminals will not hesitate to kill innocent citizens and those charged with protecting them in pursuit of their agenda of terror.
The Embassy is working closely with senior Yemeni government officials to investigate this incident. We will rely on continued close cooperation with Yemeni authorities to complete a thorough investigation and to bring the perpetrators of this heinous terrorist crime to justice.