A man poisoned thousands of dollars worth of marine fish at an aquatic store in Helena, Montana, USA.
The 70 fish were killed in an attack which took place at Underwater World last Thursday lunchtime and was caught on the store's surveillance camera.
In the footage, the suspect throws a white powder over the marine fish tanks several times, while the store's owner has his back turned. The substance used is thought to be dry chlorine bleach.
Underwater World only opened earlier this year. Owner Bob Kavajecz told KFBB.com that he was "beside himself". He said the suspect had been asking questions when he first came into the store, and had seemed friendly. But it was after the man left without saying goodbye that he noticed his seahorses and other marine fish were dying. "I just cannot believe the animals had to go through that suffering," he said.
Other fish have now started to die following the attack.
Fish losses are estimated to be around $8000 (around £4850).
PFK recently reported on an incident in which a man stole thousands of pounds worth of corals from an aquatic store, also captured on camera.