The Legionella bug causes the disease

The inquiry will now focus on the installation and maintenance of the equipment.

Detective Superintendent Kevin O'Neill said: "To date, six victims have been identified, two of which died.

"Police have made contact with all sufferers and a liaison officer has been appointed.

"The investigation is being progressed with the local environmental health officer and the Health and Safety Executive.

"An inter-agency forum has been set up and includes medical experts to support DI David Bishop and his team," he added.

Legionnaires' Disease is a very rare condition and cannot be passed from person to person.

The disease can only be contracted by breathing very fine aerosols of water containing the bacterium into the lungs.