Emergency services are continuing to work at the scene of an explosion on Clydach Road in Morriston that occurred around 11.20am this morning.
Three people have been taken to hospital by ambulance. One person is currently unaccounted for, and work is ongoing to locate them.
Two properties have been extensively damaged and other neighbouring properties have also been damaged.
A rest centre has been set up by the local authority to support those affected.
A cordon remains in place and people are asked to avoid the area while the incident is ongoing. Clydach Road remains closed, and traffic is being diverted.
A spokesperson for South Wales Police this afternoon said:
“Our thoughts are with everyone who have been affected by this morning’s incident and we would like to thank the community for their support whilst this incident is ongoing.”