Earlier in the day, Prilepin's car was blown up on the highway in the Nizhny Novgorod Region, as a result of which the driver was killed and the politician was injured, a law enforcement source told Sputnik. Permyakov was detained by the regional police in hot pursuit.
"The suspect has been detained, during interrogation he is testifying that he was acting on the instructions of the Ukrainian special services," the committee said on Telegram.
The suspect admitted having planted an explosive device along the car's path and setting it off remotely, the committee's statement read.
The Russian Investigative Committee added it had continued questioning Permyakov. Experts took swabs from his hands and clothes in order to conduct forensic examinations.
Meanwhile, the Russian Foreign Ministry stated on Saturday that the silence of international organizations on the terrorist attack on Russian writer Zakhar Prilepin is unacceptable.
"The lack of condemnation by Washington of another terrorist attack against a Russian journalist and public figure is self-revealing for the American authorities. The silence of the relevant international organizations is unacceptable," the ministry said.
The ministry noted that the responsibility for the terrorist attack on Prilepin as well as for other attacks lies not only with the Ukrainian authorities but also with "their Western patrons, primarily the US, thanks to whose efforts the anti-Russian project in Ukraine, based on neo-Nazism, has been painstakingly nurtured since the coup in February 2014."