Updated: Nov. 14, 2013 4:00 PM

ELK GROVE (CBS13) – A propane leak is the likely cause of an explosion that leveled a travel trailer in Elk Grove and critically injured a teenager Thursday morning, according to the Cosumnes Fire Department.

READ MORE: 4 Killed In Helicopter Crash Near Colusa

At around 7:35 a.m., a trailer parked next to a home in the 8000 block of Alpine Blue Court exploded, injuring a 16-year-old boy and damaging two nearby homes.

“We all know each other, and we all look out for each other’s children. And so, to see him on that ground, it just freaked me out,” said neighbor Tiffany Jackson. “I probably was more upset than his family was.”

READ MORE: 45 Structures Now Destroyed As Dixie Fire Grows To 244,888 Acres

The teen is in critical condition and has been taken to UC Davis Medical Center, according to Cosumnes Fire Department. Jackson also said the boy’s legs, hair and eyebrows were burned.

Firefighters say the cause of the explosion was a propane tank used to heat water.

MORE NEWS: Hefty Fees Part Of New Parking Experiment At Lake Tahoe Beach

Nearby residents say they heard the explosion and saw debris flying.