A woman was killed and five others injured Saturday when a large eucalyptus tree fell on a wedding party taking photographs at a Southern California park, officials said according to Fox News.

Up to 20 people were trapped under the tree after it fell at Whittier's Penn Park around 4:30 p.m., the Los Angeles County Fire Department told Fox 11.

Video from the scene showed fire crews using chain saws to cut through the downed branches. Witnesses described hearing a loud crack, and seeing people run from the area.

Four of injured suffered scrapes and bruises, officials said.

The Los Angeles Times reported that a 4-year-old girl was listed in critical condition due to head trauma.

Local officials said the tree could have been weakened by California's ongoing drought, and recent heavy rain could have been contributed to its fall.

An arborist will assess the area on Sunday, officials said.