The suspect, Oleg Belov, was wounded by police gunfire while resisting arrest and was in stable condition Wednesday after undergoing surgery, according to local health officials.
The federal Investigative Committee said the dismembered remains of the children, all under the age of 6, were discovered Tuesday in the family’s apartment in the city of Nizhny Novgorod. The body of his pregnant wife also was found in the apartment.
At a separate location, police found the remains of a woman believed to be his mother.
Police arrested the suspect late Tuesday in the Vladimir region, where he was hiding in his mother-in-law’s home. Police suspect he planned to kill her, too.
The Investigative Committee announced late Wednesday that a criminal case had been opened to determine whether police negligence had played a role in the deaths. The committee spokesman, Vladimir Markin, said five police officers were accused of ignoring repeated complaints from Belov’s wife dating back to October that Belov was threatening to kill her and the children.