Tiger Kingdom, the park where the deaths occurred, could not be reached for comment on Saturday.
Its website advertises the opportunity for visitors to touch the big cats and take photos with them.
“These tigers died the same way they lived – in misery, confinement and fear,” animal rights organization PETA Asia told AFP.
“If tourists stay away, these places will soon become unprofitable and such tragedies will be much less likely to occur,” the group said.