Police warned the Navy about gunman’s instability six weeks ago

A Newport, Rhode Island police sergeant reported Navy Yard shooter Aaron Alexis to naval station police last month after the suspect told cops he was “hearing voices” through his hotel room wall and that three people were following him and sending vibrations into his body, according to a police report obtained by FoxNews.com.

In the document, the officer said that on August 7, he was sent to a local hotel to check out a suspicious person report involving Alexis, who told him he was a naval contractor and traveled often.

The report said Alexis told the officer that while flying from Virginia to Rhode Island, he got into an argument with someone else at the airport who he believed had sent three people to follow him and keep him awake by talking to him and sending vibrations into his body. …

The Naval Station Police official told the sergeant “they would follow up on this subject” and determine if Alexis was, in fact, a naval base contractor.