WHITTIER (CBS SF) — A woman was killed and five others were injured when a large eucalyptus tree fell on a wedding party taking photographs at a Southern California park Saturday, authorities said.

Several people were trapped under the tree at Whittier’s Penn Park, the Los Angeles County Fire Department said.

READ MORE: Torrential Rains Ease 'Exceptional' Drought Conditions In Marin County

Video from the scene showed fire crews using chain saws to cut through the downed branches.

Four of the injured suffered scrapes and bruises, officials said. A 4-year-old girl was listed in critical condition due to head trauma, the Los Angeles Times reported.

READ MORE: State Could Ban Crab Traps as Dungeness Crab Season Approaches

Witnesses described hearing a loud crack and seeing people run from the area.

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

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

MORE NEWS: Stolen RV Pursuit Ends In Horrific San Ramon Crash

No other details were immediately available.