A United Nations medical worker who was infected with Ebola in Liberia has died despite "intensive medical procedures," a German hospital said Tuesday.

The St. Georg hospital in Leipzig said the 56-year-old man, whose name has not been released, died overnight of the infection. It released no further details and did not answer telephone calls.

The man tested positive for Ebola on Oct. 6, prompting Liberia's UN peacekeeping mission to place 41 staff members who had possibly been in contact with him under "close medical observation."

He arrived in Leipzig for treatment on Oct. 9. The hospital's chief executive, Dr. Iris Minde, said at the time that there was no risk of infection for other patients, relatives, visitors or the public.

The man was kept in a secure isolation ward specially equipped with negative pressure rooms that are hermetically sealed and can only be accessed through a number of airlocks. All air and fluids are filtered and all equipment is decontaminated after use, Minde said.

The Ebola patient was the third to be flown to Germany for treatment.

The first, a Senegalese man infected with Ebola while working for the World Health Organization in Sierra Leone was brought to a Hamburg hospital in late August for treatment. The man was released Oct. 3 after recovering and returned to his home country, the hospital said.

Another patient, a Ugandan man who worked for an Italian aid group in West Africa, is undergoing treatment in a Frankfurt hospital.