Major evacuation in Oklahoma city as toxic spill makes air 'unsafe to breathe'

About 1,000 residents are being evacuated from their homes in Weatherford (Image: NEWS9)

A major chemical spill prompted the evacuation of more than 1,000 people in a major city. A semi-truck crashed and spilled ammonia in Weatherford, just west of Oklahmoa City in America on Wedesday. At least 36 people have been hospitalised after being exposed to the dangerous chemical, officials said.

The collision occurred at around 10pm and emergency alerts were sent out roughly an hour later, authorities said. Police warned that the air is not safe to breathe. An emergency alert read: "City of Weatherford partial evacuation due to chemical spill at Holiday Inn Express. Evacuate north to Davis Ave and from Washington Ave to Lyle Rd.

At least 36 people have been hospitalised, (Image: News9)

"Safety location is Pioneer Cellular Center (SWOSU Basketball Gym). If you are having medical symptoms, call 911, or medical personnel located at Ace Hardware."

Witnesses reportedly saw people wearing gas masks and knocking on their people's doors to try and wake them up.

In response, schools in the area and Southwest Oklahoma State University cancelled their classes on Thursday.

The Weatherford Police Department issued a warning, telling people in other areas to stay indoors.

The force said: "Due to an accidental chemical release, The Weatherford Emergency Department is requesting all residents East of Washington St, South of Davis Ave, North of Main St to shelter in place until further notice.

"Residents in this area are encouraged to turn off their AC/Heating systems to prevent the chemicals from entering their home. Businesses in this area should remain closed. Weatherford Public Schools has closed down all campuses today."