From a Washington Post story by Paul Farhi headlined “Associated Press reporter fired over erroneous story on Russian attack”:

The Associated Press on Monday fired a national security reporter who had provided erroneous information about a missile strike in Poland last week that resulted in a widely circulated but inaccurate news alert and story suggesting Russia was responsible for the incident.

James LaPorta, 35, was terminated after a brief investigation, people at the news organization confirmed to The Washington Post.