Emergency crews responded to a fire at an apartment building on Saturday night that left the structure uninhabitable and displaced nearly 20 residents.

Police received calls about the fire at 1 Maryland Circle after 8 p.m. on Dec. 13, according to Sergeant Kevin Sell of the Whitehall Township Police Department.

Officers told reporters the building is “unsafe to inhabit,” and as of Dec. 14, no one is allowed inside.

The cause of the fire remains unknown and will need to be investigated by the fire department, Sell said. The Whitehall Township fire chief did not immediately respond to inquiries.

Nineteen residents relied on volunteer assistance following the fire, according to the Red Cross Pennsylvania Rivers Chapter. The organization set up a temporary shelter at Whitehall Township High School and provided food, shelter, relief supplies, emotional support and other assistance to those affected.