WARNING: GRAPHIC CONTENT
At least 24 dogs were killed by Eastern Securities, animal campaigners said
US firm accused of killing them after contract with Kuwaiti oil firm ended
Workers had not been paid for two months so allegedly took action
Employee claims the dogs were sick and some were meant to be put down
But colleague 'jumped the gun' and slaughtered them all in one go, he said
Grim photos show piles of dead dogs and worker stood on top of a body
Very graphic.