THREE Mexican drug dealers have been arrested over the presumed murder of Australian tourists Adam Coleman and Dean Lucas.
Chief prosecutor in the state of Sinaloa, Marco Antonio Higuera Gomez, said the three were -operating as part of a highway robbery gang, along with two other suspects, who are still on the run. 
The trio apparently confessed that they flashed police-like lights to stop the van, then shot a "long-haired tourist" in the face when he resisted their robbery. The gang killed the second man, drove the vehicle to -another location and "set fire to the van with two bodies -inside," the prosecutor said.
The gang had been wearing police uniforms and were caught with an armoury of weapons as well as 124 bags of the drug ice.
Lucas and Coleman, both 33, were last reported in the -Sinaloa town of Topolobampo on   November 20.
The two men had driven from Edmonton, Canada to Mexico to join Coleman's Mexican girlfriend in the western city of Guadalajara.
Their burned-out van was found with two unidentified bodies last weekend.Mr Coleman's sister Emily, who is an Indigenous supermodel, last night paid tribute to her brother, saying he was "life of the party" and who "danced up a storm" at her wedding reception almost a year ago to the day.