A team of Criminal Investigation Department (CID) visited the Bangabandhu Sheikh Mujib Safari Park in Gazipur on Monday to probe the the deaths of several animals, including zebras.
Additional DIG of CID, Imam Hossain, said samples were collected from the park for tests at CID laboratory.
The causes of the deaths of the animals will be known after the tests, he said.
The CID team, led by Dr. Nazmul Karim Khan, visited the spot and talked to the officials of the park.
READ: Safari Park animal deaths: Minister promises strict action against anyone found involved
So far this year, 11 zebras, one lioness and a tiger died at the Gazipur Safari Park.
Of them 10 zebras died from January 2 to 24.
Environment, Forest and Climate Change Minister Md Shahab Uddin on Sunday said exemplary actions will be taken against anyone found involved or responsible for the deaths.
The minister said a five-member probe body has been formed and it has been given 10 days to submit a report.
READ: Animals at safari park died from bacteria:Minister
Three officials - project director, veterinary officer and in-charge of the park - have been removed from their posts to ensure an impartial investigation, he said.