Efforts were underway to free those trapped, fire officials said.
(CNN) --
A building collapsed Saturday morning in North Philadelphia, trapping several firefighters, the city's fire department said in a tweet.
“So far, several have been rescued and transported to hospitals,” the Philadelphia Fire Department tweeted.
The department was still working to rescue others, he added.
Details about what led to the collapse, which the department said occurred at 300 W. Indiana St. in the city's Fairhill neighborhood, or what the building housed were not immediately available.
Efforts were underway to free those trapped, fire officials said.
At least nine agencies were assisting with recovery efforts, including the Philadelphia police and the American Red Cross, the fire department added on Twitter.
This is a developing story and will be updated.