MOSCOW (AP) — The daughter of an influential Russian political theorist often referred to as “Putin’s brain” was killed in a car bombing on the outskirts of Moscow, authorities said Sunday.

The Moscow branch of the Russian Investigative Committee said preliminary information indicated 29-year-old TV commentator Daria Dugina was killed by an explosive planted in the SUV she was driving Saturday night.

There was no immediate claim of responsibility. But the bloodshed gave rise to suspicions that the intended target was her father, Alexander Dugin, a nationalist philosopher and writer.

Dugin is a prominent proponent of the “Russian world” concept, a spiritual and political ideology that emphasizes traditional values, the restoration of Russia’s power and the unity of all ethnic Russians throughout the world. He is also a vehement supporter of Russian President Vladimir Putin’s move sending troops into Ukraine.

The explosion took place as his daughter was returning from a cultural festival she had attended with him. Russian media reports cited witnesses as saying the SUV belonged to Dugin and that he had decided at the last minute to travel in another vehicle.

The car bombing, unusual for Moscow, is likely to aggravate tensions between Russia and Ukraine.

Denis Pushilin, president of the separatist Donetsk People’s Republic, the pro-Moscow region that is a focus of Russia’s fighting in Ukraine, blamed the blast on “terrorists of the Ukrainian regime, trying to kill Alexander Dugin.”

Mykhailo Podolyak, an adviser to Ukrainian President Volodymyr Zelenskyy, denied Ukrainian involvement, saying, “We are not a criminal state, unlike Russia, and definitely not a terrorist state.”

Political analyst Abbas Gallyamov, a former speechwriter for Putin, called the attack “an act of intimidation” aimed at Kremlin loyalists.

To them, he said, “this is a symbolic act, demonstrating that hostilities have been confidently transferred to the territory of Russia, which means that this is no longer an abstract war that you watch on TV,” he said. “This is already happening in Russia. Not only Crimea is being bombed, but terrorist attacks are already being carried out in the Moscow region.”

While Dugin’s exact ties to Putin are unclear, the Kremlin frequently echoes rhetoric from his writings and appearances on Russian state TV. He helped popularize the “Novorossiya,” or “New Russia” concept that Russia used to justify the 2014 annexation of Ukraine’s Crimean Peninsula and its support of separatist rebels in eastern Ukraine.

He promotes Russia as a country of piety, traditional values and authoritarian leadership, and disdains Western liberal values.

His daughter expressed similar views and had appeared as a commentator on the nationalist TV channel Tsargrad, where Dugin had served as chief editor.

Dugina herself was sanctioned by the United States in March for her work as chief editor of United World International, a website that the U.S. described as a disinformation source. The sanctions announcement cited a United World article this year that contended Ukraine would “perish” if it were admitted to NATO.

Dugina, “like her father, has always been at the forefront of confrontation with the West,” Tsargrad said Sunday.