With no claim of responsibility or apparent motive, a high-explosive bomb went off outside a medical center in Cyprus’ capital Nicosia, which sparked a fire there after the explosion around 1:30 a.m. on Dec. 28.

Additional media reports said the explosion took place outside Dikteon Medical Center in Strovolos, said Kathimerini Cyprus, with police spokesman Christos Andreou adding that firefighters were sent to control the blaze.

Investigators then determined that a high explosives device had been placed at the entrance of the building owned by a 47-year-old male, who was not identified, the paper said.

Security camera footage from the area was expected to provide more clues with officials saying the police department’s criminal investigation divison was investigating but offered no reason for the blast.

There has been tension on the island over lockdowns aimed at slowing the spread of COVID-19 with some upset about non-essential businesses not being allowed to open at times.