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By Rachael Trost

The hunt for two brothers wanted in the murder of a missing Washington couple has gone national, after officials located a vehicle belonging to one of the men in Phoenix.

The brothers, John Blaine Reed, 53, and Tony Clyde Reed, 49, are now charged with first degree murder in the deaths of Patrick Shunn and Monique Patenaude.

Shunn and Patenaude were reported missing on April 12. One of the brothers was a former neighbor of the couple, and friends have said there was a nasty, long-running dispute between them.

John Reed (left) and Tony Reed (right)Snohomish County Sheriff's Office

The missing couple’s two vehicles were located last Thursday down an embankment in a remote wooded area, officials say. Evidence recovered from inside the vehicles, including blood, rubber gloves, a tarp and towels, as well as items found in the former home of one of the suspects, led police to believe foul play is involved.

Charging documents say blood was found in both vehicles, with the "largest concentration of blood... in the cargo, consistent with a body having laid there some amount of time."

The Snohomish County Sheriff’s Office also recovered surveillance video “tying the Reed brothers to the disposal of Shunn’s and Patenaude’s vehicles," according to NBC affiliate KING 5.

The red 2007 Volkswagen EOS Coupe the brothers were driving was found Monday in Phoenix. They are believed to now be driving a 2002 gold Acura 32T with Arizona license plate BNN-9968, according to a press release from the Snohomish County Sheriff's Office. A plate reader reportedly hit the license plate in Calexico, California Tuesday. Authorities say the two may be heading to the Mexican border.

Search warrants requesting access to several properties related to the search for the couple reveal they were afraid of the older brother, John Reed.

Patrick Shunn and his wife, Monique Patenaude.Snohomish County Sheriff's Office

The couple reportedly told friends Reed made threats to “shoot” them over a long-standing property dispute.

Reed had once owned the property adjacent to the couple’s 20-acre farm outside Arlington, Washington, but Snohomish County bought it from him after the Oso landslide in 2014, according to charging documents. Patenaude had reported to the country several weeks ago that Reed was squatting on the property.

Charging documents reveal Reed had told another neighbor in 2013 that he was "capable of killing people without any problem," and that law enforcement would never be able to locate the bodies.

The Reed brothers are both convicted felons, and police believe they are armed and dangerous. Authorities are asking anyone who spots them to call 911 immediately.