ANKARA, Turkey, Feb. 3 (UPI) -- At least four people were killed and 27 were injured in an explosion at a machinery factory Thursday in Ankara, Turkey, Interior Minister Besir Atalay said.
Atalay said four of the injured were critical, Turkey's Anadolu news agency reported.
"There are a few worker trapped under the debris," experts from the Turkish Red Crescent said as rescue workers searched for more victims.
Two floors of the four-story building collapsed, and the blast broke nearby building and car windows, Anadolu reported.
The cause of the explosion was under investigation, the news agency said.