Hong Kong authorities are carrying out tests to find out what killed eight monkeys, which were found dead in the city’s oldest zoo on Sunday, the government said on Monday.

Hong Kong temporarily closes zoo after eight animals die in one day - Tests underway to determine cause of sudden deaths

Officials in Hong Kong are investigating the deaths of eight monkeys in the region's oldest zoo, including 3 critically endangered Cotton-top Tamarins.

Hong Kong authorities are investigating the deaths of eight monkeys found dead at a Hong Kong zoo, which was partly closed on Monday for disinfection, with necropsies launched to ascertain the cause of the animals’ deaths.

A De Brazza's monkey, a common squirrel monkey, three cotton-top tamarins and three white-faced saki monkeys found dead The mammals section of a Hong Kong zoo was closed on Monday after eight monkeys were found dead,