THE Boulevard Mall in Las Vegas has been locked down as dozens of police vehicles converge amid reports of an ‘active shooter’.

The shopping complex, on on Maryland Parkway, is surrounded by police and supporting ambulance and fire services.

Armed officers have been seen gathering at the entrance to a Sears store.

Police are yet to provide any details.

Local media is reporting nearby streets, including Maryland and Sierra Vista, are being blocked by police. All entrances to the mall are being blocked.

Eyewitnesses say the police appear to be converging on the the parking station at the Twain, Maryland Parkway intersection. Helicopters are circling the scene.