Rocker Jimmy Barnes was evacuated from a hospital in Sydney, Australia on Monday (15Sep14) amid a major police operation.

The Cold Chisel frontman has been recovering from back surgery at a medical centre in the city, and he was among hundreds of patients who were escorted out of the facility as cops conducted a major sweep.

Reports suggest the operation, which targeted four hospitals around Sydney, was due to a bomb scare.

Barnes posted a picture on Twitter.com showing himself sitting in a wheelchair outside the hospital holding a bag of fluid from an intravenous drip. He added in a caption, "Not panicking, but anyone for brain fluid?"