Two workers were killed and several injured when a crane collapsed at the National Art Gallery construction site on Coleman Street on Monday morning.

Reports said the crane was lifting a mini excavator at around 10.30am when the boom suddenly collapsed.

The boom and excavator fell to the ground, while concrete slabs attached to the rear of the crane came loose and fell on to scaffolding below.

The two workers were pronounced dead at the scene by trauma paramedics, according to the Singapore Civil Defence Force (SCDF).