Hazmat incident sends 4 people to the hospital in Chester, Pennsylvania

CHESTER, Pa. (WPVI) -- A hazmat incident sends four people to the hospital on Wednesday night.

It happened around 7:30 p.m. at Wallingford Estates Apartments in Chester, Pennsylvania.

Authorities tell Action News four residents complaining of an ammonia odor were taken to the hospital as a precaution.

Delaware County officials are continuing their investigation.