Five wolves managed to escape from Colchester Zoo after the perimeter fence was damaged.
Two of the wolves were shot and killed, one was recaptured while the other returned voluntarily.
Essex Police are searching for the remaining wolf who is thought to be sheltering in thick undergrowth.
A police helicopter has been deployed to assist with the search.
For more on this story visit ITV Anglia
More top news
Yahya Jammeh, who has ruled Gambia for more than 22 years, says he no longer accepted defeat in the country's presidential election.
Local authorities are taking a zero-tolerance approach to fly-tipping in the run up to Christmas as clean up costs spiral to £50 million.
President Obama has ordered a review into the email hacking that rattled the US presidential campaign, according to a White House official.