A very large explosion at a fertilizer plant in a small Texas town has left left hundreds injured and several feared dead, according to CNN.

The blast took place at the West Fertilizer Plant in West, Texas around 8:50 p.m. Town residents tell CNN there may be at least 50-60 homes completely demolished due to the blast.

Many search and rescue efforts were initially limited due to toxic fumes being emitted from the plant as well as the possibility of a second fertilizer tank exploding. According to KWKT, authorities had informed the citizens of West to evacuate the city immediately, due to fears of a second explosion.

The exact cause of the blast is currently unknown at this time.

“Nothing at this point indicates we have had criminal activity, but we are not ruling that out,” Waco Police Sgt. William Patrick Swanton told CNN.

Continue to check back for updates.