DNA tests have determined that two sets of remains found in Fairfax County over the past two years belonged to brothers who disappeared from Prince William County in 2010, Fairfax police said Thursday.

Virginia’s medical examiner had previously determined that the cause of death in both cases was homicide because both sets of remains showed blunt force trauma to the upper body, police said.

Manuel Mireles-Garcia and Alberto de Jesus Mireles-Garcia were last seen by family members about 10 p.m. on May 10, 2010, in the Triangle area, according to Prince William police. Both were in their early 30s. Relatives reported their disappearance two days after they were last seen.

The brothers’ vehicles were at their Triangle residence, but their IDs and keys were gone, police said. A search of the brothers’ shared apartment in the 18700 block of Fuller Heights Road turned up no additional clues to their whereabouts, police said.

Family members remain baffled by the brothers’ disappearance and their apparent killings.

“They were regular . . . guys who went to work every day, Ruben Garcia, a cousin, said.

Manuel’s skeletal remains were discovered just off the road in the 10200 block of Furnace Road in the Lorton area July 12, 2010, police said. He was wearing a chain necklace with a stone, heart pendant and an “evil eye” talisman attached, police said.

He also had on a green American Eagle-brand track suit, Cherokee-brand pajama pants, a blue T-shirt with a picture of a hot rod and a pair of white Reebok sneakers, according to police.

Alberto’s skeletal remains were discovered about a mile away on Furnace Road on March 15, 2011, police said. They were found at the base of a railroad trestle bridge by a man walking between Richmond Highway and Old Colchester Road, police said.

Police released no other details about the case. “They weren’t found too far apart from each other, but it wasn’t exactly close,” said Eddy Azcarate, a spokesman for the Fairfax police. “We don’t know when they died or where. It’s all still under investigation.”

Staff researcher Jennifer Jenkins contributed to this report.