Fire crews in Halifax are investigating after a fire at an apartment building on Lacewood Drive in the Clayton Park area.

The crews were called to 179 Lacewood Drive at about 3.30 a.m. Friday and found part of the three-storey building engulfed in flames.

"Two units involved are burnt out, extensively damaged. The next units beside it have some smoke damage but the rest of the apartment [building] is still in good shape," said Halifax Fire's acting divisional commander Vince Conrad. 

No one who lives in the building was hurt, he said. 

"We had to make a few rescues of people who needed assistance leaving the building, a couple of people were trapped on their balconies. Once we got the fire under control, we assisted with that," said Conrad. 

One firefighter was hurt, but his injuries were minor.

"When they were making the advance with the hose into the building ... he received a bit of a shock. It was not serious but he was taken to hospital to follow up," said Conrad. 

The cause is now under investigation. 

179 Lacewood Fire

The Red Cross says volunteers are in the process of setting up a reception centre for the tenants displaced by the morning's fire. (Elizabeth McMillan/CBC )

The Red Cross said more than 20 people were forced out of the building due to the fire. Some residents waited in a Halifax Transit bus as crews extinguished the fire.

Many were allowed to go back in the 16-unit building briefly to get clothes and personal items. The Red Cross said cleanup and investigation of the fire is expected to take most of Friday. 

Volunteers with the Canadian Red Cross are helping tenants whose units burned with clothing, emergency needs and a warm meal.

They are setting up a shelter at the Captain William Spry Community Centre on Sussex Drive, the organization says. 

With files from Sandy Smith