Rembrandt's "Portrait of the Father," stolen for the second time back in 2006 from a museum in Serbia, has been recovered. Police found the $4 million painting about 40 miles away from the museum, but three other paintings stolen at the same time are yet to be found. Four people have been arrested in connection with the case, the BBC reports. Radio Free Europe adds that the robbers tied up a guard to steal the paintings. The portrait of Rembrandt's father, from 1630, had been stolen the first time in 1996, and later found in Spain. (More Rembrandt stories.)