A massive fire spread through a high-rise in Hong Kong , leaving destruction in its wake.

While at least four are dead, and two more are in critical condition, others, including firefighters, are also injured, but an exact number is unknown at this time, according to Reuters.

Here's what to know about the fire.

When did the fire start?

The fire department received reports of the fire at 2:51 p.m. local time, and by 3:34 p.m., it was upgraded to a No. 4 alarm, the second-highest level.

What caused the fire?

The cause of the fire is unknown, the BBC reported. But the flames are believed to have spread quickly due to the bamboo scaffolding covering the exterior of the high-rise.

The building, which has been occupied since 1983, was undergoing major renovations, Reuters reported. Ho

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