For the second time in under a week a school in Metro Vancouver has been damaged by fire, this time in Port Coquitlam.

Fire crews responded to B.C. Christian Academy on Fernwood Avenue late Thursday night.

When they arrived they discovered a fire burning through the exterior wall of a portable classroom.

"The damage was kept to mostly the exterior portion, though we have heavy smoke and water damage to the inside of the portable," said Deputy Chief Robert Kipps. "The guys did a good job, quick knockdown with exterior water attack."

While the cause of the fire has so far not officially been deemed suspicious, that's not the case in Delta where a suspected arson earlier in the week is being blamed for $100,000 in damage.

On Wednesday, crews found a fire burning against the wall of Sunshine Hills Elementary School and the flames quickly spread inside.

Eventually firefighters had to use saws to cut through the metal roof to get at the flames.

Both of the fires are still under investigation.