A massive explosion rocked Beirut on Tuesday, flattening much of the city's port, damaging buildings across the capital and sending a giant mushroom cloud into the sky. Around 100 people were killed and 3,000 injured, with bodies buried in the rubble, officials said.

It was not clear what caused the blast, which struck with the force of a 3.5 magnitude earthquake, according to Germany's geosciences center GFZ, and was heard and felt as far away as Cyprus more than 200 kilometers (180 miles) across the Mediterranean.