INVESTIGATIONS into what caused a hospital explosion are still taking place.

But most of the pharmaceutical unit at Huddersfield Royal Infirmary has reopened after the blast.

Two members of staff suffered minor cuts and burns when a steam steriliser blew up last Thursday.

They were treated in accident and emergency before being allowed to return home.

The unit stayed closed for investigation.

But an HRI spokeswoman said yesterday: “Most of it has now reopened.

“The area in the immediate vicinity of the explosion remains closed and investigations are ongoing and will continue for some time.”

The blast, which happened at lunchtime, left glass embedded in a wall.

The steriliser, a pressure vessel used for chemical procedures, is one of several in the department, which makes medicines to distribute to GPs and hospitals nationwide.