Iranian officials are investigating an explosion that turned the skyline east of the capital, Tehran, a bright orange for several seconds early on Friday morning, official news agencies reported.
A spokesman for the defense ministry, Brig. Gen. Davoud Abdi, told state television that a gas explosion had occurred at Parchin, a military and nuclear research base, but that there were no casualties and that the fire was under control.
“Our colleagues are present on the ground and investigating the incident carefully,” General Abdi said.
Many residents of Tehran and surrounding suburbs posted accounts on social media asking if others had seen the sky suddenly turning orange or had heard two consecutive booms.
“We suddenly saw this scene and we were all terrified,” tweeted Hamid Reza, who posted a video he shot from a mountaintop in northern Tehran.
Tehran’s head of emergency response told local media that workers had received no immediate requests for ambulances or medical aid but were on standby.