The minister wrote on Facebook, Censor.NET reports.
Avakov wrote: "Turchynov's wife faced an armed attack a few hours ago... The perpetrator assaulted Hanna Turchynova right inside the institute where she works. He was armed with a knife and was shouting: "You will answer for everything you've done bi#ches!"
"And he received an answer when he was neutralized and apprehended. The National Police rapidly snapped into action. The investigation is now underway, the terrorist is being interrogated.
"The assailant, a resident of the Donetsk region, purposefully came from the occupied territory to attack the members of Turchynov's family.
"A set of bladed weapons was seized from the detained terrorist. He behaved arrogantly during the interrogation, issuing threats against Turchynov and state leadership, shouting that there are others who will finish what he has started."
The National Police Communications Department Head Artem Shevchenko later wrote that the detainee was charged with attempted homicide. He also posted video footage of detention.