Six endangered wolves found dead in Washington were poisoned, officials say

The state's wildlife agency is offering a reward of $51,000 for tips leading to conviction in the case to help protect the animals

Six endangered wolves found dead in north-east Washington this year were poisoned, officials announced on Monday, and a reward is being offered for tips leading to a conviction in the case.

Washington state's department of fish and wildlife said the agency had been investigating wolf deaths within the territory of the Wedge pack in Stevens county since authorities there discovered four dead wolves on 18 February.