MOSCOW — Cheered on by a small crowd, masked men vandalized the offices of a human rights advocacy group in Grozny, the capital of the Russian region of Chechnya, on Wednesday.

Employees of the Committee Against Torture, some of whom fled through windows as the vandals smashed into the office with crowbars, said the local authorities had ignored calls pleading for help. They suggested that the attack was officially sanctioned by the government of Chechnya, which is led by Ramzan A. Kadyrov, a close ally of President Vladimir V. Putin of Russia.

It was not the first attack on the Committee Against Torture, which seeks to draw attention to human rights abuses in Chechnya and throughout Russia. In December, the group’s offices were firebombed.

The firebombing occurred shortly after the group criticized Mr. Kadyrov for engaging in “collective punishment” by destroying the homes of family members of men accused in a shooting attack blamed on Islamic insurgents.