Supporters of a coup in Niger have attacked the headquarters of the ousted president's party, setting it on fire and stoning and burning cars outside.
The small group of arsonists had broken away from a larger show of support for the coup leaders outside parliament, where Russian flags were on show.
The army has now given its backing to the troops who took President Mohamed Bazoum captive on Wednesday.
Russia joined other countries and the UN in calling for Mr Bazoum's release.
The 64-year-old, who was elected as Niger's president two years ago, is a key Western ally in the fight against Islamist militants in West Africa.
The US and France, the former colonial power, both have military bases in the uranium-rich country - and have condemned the coup.
US Secretary of State Antony Blinken called up Mr Bazoum promising Washington's "unwavering support".
Mr Bazoum took to Twitter on Thursday morning to issue a defiant statement: "The hard-won achievements will be safeguarded. All Nigeriens who love democracy and freedom will see to it."
His foreign minister has also been trying to rally support and urge dialogue, but the army chief of staff said he was backing the takeover to avoid fighting within the armed forces.
It remains unclear who is really in charge of Niger as the junta has not announced its leader.
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