Russian investigators say a fourth suspect in the murder of a high-ranking police officer and five of his relatives has been apprehended.
Russia's Interior Ministry said the suspect - an ethnic Tajik named Mahmadali Ahmadov -- was detained at Moscow's Domodedovo Airport on May 4 upon his arrival there from Dushanbe, Tajikistan.
On May 3, the investigators identified three other suspects who had been arrested earlier, saying they were all natives of Azerbaijan -- Roman Fataliyev, Islam Babayev, and Orxan Zahrabov.
The deputy chief of staff of the Samara region's Interior Department, Andrei Gosht, was found dead at his home in Syzran on April 24 along with five of his relatives.
Russia's Investigative Committee has said that all of the suspects will be charged with murder and robbery.