More than 180 Iranian MPs appear to have snubbed an invitation to celebrate President Mahmoud Ahmadinejad's election win, local press reports say.
All 290 MPs were invited to the victory party on Wednesday night, but only 105 turned up, the reports say.
A BBC correspondent says the move is a sign of the deep split at the top of Iran after disputed presidential polls.
Meanwhile, Mr Ahmadinejad has told the US not to interfere in Iranian politics, the Fars news agency reports.
"I hope you [US President Barack Obama] will avoid interfering in Iran's affairs and express regret in a way that the Iranian people are informed of it," he was quoted as saying.