The two men were arrested on Wednesday night by Polish police, according to a statement from police in Gothenburg.
The two men have long figured in the investigation of the October 19th killings of 69-year-old dairy farmer Torgny Antby and his 71-year-old wife Inger on their dairy farm in Långared outside of Alingsås.
An arrest warrant was issued for them on November 7th.
The couple was set to participate in a choir performance at a care home that day but failed to turn up. A group of friends and neighbours went to the couple's farm and called police after discovering Torgny Antby's body in a barn.
His wife's body was later discovered in the couple's house by police.
According to prosecutors, Torgny was killed after being repeatedly struck in the head with a hard object, while Inger died of strangulation.
Both victims had been tied up and had tape wrapped around their heads and faces.
The two suspects are also believed to have stolen a safe from the couple's home.
Two other men who had previously been held during the investigation's early stages on suspicion of carrying out the double murder have since been excluded from the ongoing probe.