The mother-in-law and a brother-in-law of Maksharip Aushev, killed Oct. 25 when his car was strafed with gunfire as he drove along a federal highway, were killed Wednesday when police in the republic of Ingushetia fired on their propane-fueled car as it made a U-turn near a checkpoint and fled, said Kaloi Akhilgov, a spokesman for Ingush President Yunus-Bek Yevkurov.
Aushev's 27-year-old widow and another brother-in-law were injured in the blast, in Nazran, Ingushetia's largest city, Akhilgov told The Moscow Times.
He said denied Interfax and RIA-Novosti reports the explosion was caused by a remote-controlled bomb.
Aushev, 43, was a businessman from a prominent family who campaigned against abductions by security forces in Ingushetia.
Ingushetia, which neighbors Chechnya, is one of Russia's poorest and most restive regions, destabilized by alleged corruption, high-profile crimes, anti-government protests and allegations of human-rights abuses.
Suicide bombings at police checkpoints have also increased in frequency, including one Thursday at a Nazran checkpoint, which wounded at least 16 officers and two civilians, officials said.