Health chiefs have admitted that they do not know when a Tayside hospital which was closed last month by a boiler fault will be able to reopen.
Montrose Royal Infirmary remains shut due to "environmental issues", including soot blowing through its air filter system.
It has been closed since 24 April, when the boiler fault shut off heating and water to the building.
Patients have been transferred to other local facilities during the closure.
During that period, 10 babies have been delivered in Arbroath instead of Montrose, and six local inpatients are being cared for in Brechin Infirmary.
Ante-natal and post-natal maternity services are being provided at the Links Health Centre in the town.
Nurse director Margaret McGuire said a "full environmental and system review" was ongoing at the hospital.
She said: "There are currently issues with a number of systems, including the water, heating and filtration systems, and we must be entirely satisfied that the environment is clean and safe for both patients and staff before the hospital can reopen.
"The complexities of the systems which have been damaged means it is currently difficult for us to identify a date for reopening. We know that no-one would want us to open the hospital before we could be absolutely sure there was no risk to patient and staff safety and we hope they understand that we are doing our best to remedy the situation.
"We appreciate the public's understanding at this time and apologise for any inconvenience the transfer of services has caused."