Firefighters battle flames and exploding propane tanks during homeless camp fire in London

Firefighters called to a blaze at the Watson Street Park homeless camp at around 10 p.m. ET Sunday had to deal with exploding propane tanks and a tough-to-access fire.

The fire was previously thought to have been intentionally set but police now say the person arrested at the scene was charged with failing to meet bail conditions, not arson. The fire is deemed suspicious. 

"A fire near the river was reported by an individual and it quickly escalated to a much larger response because we were getting multiple calls from different areas," said platoon Chief Gary Mosburger. 

"Because of the road construction and where it was, access was a bit of a challenge. We had to come in from a different direction down a bike path to be able to access the fire and had to relay water in." 

"At the height of the fire, we did have several propane tanks that were exploding, so we did have a fairly significant hazard at the site to deal with," Mosburger added. "It can definitely be a scary situation for our firefighters, but we're one of the highest-trained professions when it comes to an all-hazard approach." 

There's no information about how many people were living at the camp at the time of the blaze. 

Another fire on Hubrey Road

Fire crews were also called out to another fire overnight, this time at an industrial area off Wilton Grove Road, Mosburger said.

"When they arrived, our crews found a very large commercial business trailer that was fully involved." 

A man and his dog had left the trailer before fire crews arrived. The fire isn't suspicious but the trailer is destroyed. Damage is pegged at $150,000.