Sheriff Ty Trenary said Sunday that evidence found in the recently found vehicles of Patrick Shunn, 45, and Monique Patenaude, 46, as well as in the former home of one of the suspects, led detectives to conclude that foul play is involved in their disappearance on Monday.

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A missing Arlington couple have been killed, and detectives are seeking two brothers in connection with the slayings, according to the Snohomish County Sheriff’s Office.

Sheriff Ty Trenary said Sunday that evidence found in the recently found vehicles of Patrick Shunn, 45, and Monique Patenaude, 46, as well as in the former home of one of the suspects, led detectives to conclude that foul play is involved in their disappearance on Monday.

No bodies have been found, and Trenary said searchers were currently focusing on rough ground around Oso near where the victims’ cars were found abandoned.

Trenary said sheriff’s detectives are seeking two men, John Blaine Reed, 53, and his brother, Tony Clyde Reed, 49, in connection with the disappearances.

“Major-crimes detectives have established probable cause for the arrest of two men suspected of murdering Patrick Shunn and his wife, Monique Patenaude,” Trenary announced Sunday.

The men are believed to be in the Ellensburg area, Trenary said. He added that John Reed’s vehicle was found in Ellensburg on Saturday. He said both brothers are felons and should be considered armed and dangerous.

Court records indicate that Tony Reed has an extensive criminal history, including arrests for assault with a deadly weapon, burglary and theft.

Trenary said detectives found evidence linking the men to the suspected homicides in John Reed’s former home in Arlington, which is not far from the missing couple’s property.

Related video: John Reed describes Oso landslide

John Reed was in the front yard of his house on the north side of the Stillaguamish River on March 22, 2014 during the Oso landslide. Read more. (Marcus Yam / The Seattle Times)

John Reed was widely quoted as one of the few surviving witnesses of the Oso landslide, which killed 43 residents on March 22, 2014.

The sheriff said the brothers are believed to be driving a red 2007 Volkswagen EOS coupe, with Washington plates AXH5106.

The sheriff issued a statement from the couple’s families, saying they are “loved by friends and family” and their 20-acre Arlington farm and their animals were their “passion.”

Using a rescue helicopter, deputies said they found their missing vehicles, a 2000 Land Rover Discovery and a 1995 Jeep, near each other in some woods in the Oso area Thursday, according to sheriff’s spokeswoman Shari Ireton.

It appears both vehicles went over an embankment, Ireton wrote in a news release.

Trenary said Sunday that the sheriff’s office had recovered surveillance video “tying the Reed brothers to the disposal of Shunn’s and Patenaude’s vehicles.”

Neighbors reported the couple missing Tuesday afternoon after finding their livestock untended.

Shunn went to work Monday, but he didn’t show up Tuesday at his job in Kirkland, investigators said. Patenaude was last seen about 1 p.m. Monday near the couple’s home in the 27800 block of Whitman Road.

Shunn’s uncle, also named Patrick, has said that in addition to the vehicles being gone, both of the couple’s cellphones had been turned off.

Since the couple went missing, friends and relatives have taken to social media to express concern over their disappearance and to spread the word about the case.

Shunn’s brother, Erik, posted on Facebook last week it was unlike his brother to not show up or call into work, adding: “Pat and Monique have pets and livestock and they haven’t been taken care of the last day and a half.”

He added in a post Wednesday: “I have told several of my closest friends I have a bad gut feeling on this one.”