4 hospitalized after gas leak at Wilmington refinery

Authorities have stopped a gas leak at a refinery in Wilmington Thursday that sent four workers to the hospital. 

The gases that were leaking at the Marathon plant near 2101 E. Pacific Coast Highway were reported to be butane and hydrogen sulfide, according to the Los Angeles Fire Department.

Paramedics transported four patients: a 40-year-old man in serious condition; and three other men -- ages 26, 35, and 43 -- in "moderate" condition, according to authorities.

The cause of the leak remains under investigation. 

No other information was immediately available.