From the New York Times this morning:
It was not clear whether Mr. Moussavi had been influenced by the call for calm or by fears of renewed official violence against his supporters if the protest went ahead. . . .
Mr. Ahmadinejad dismissed the opposition’s allegations of fraud, saying that the victory had given him a bigger mandate than ever. He criticized Mr. Moussavi, the main opposition candidate — who remained at home on Sunday with security forces closely monitoring his movements — in a veiled statement that many here saw as a threat.
“He ran a red light, and he got a traffic ticket,” Mr. Ahmadinejad said of his rival during a news conference at the presidential palace.
I think it’s clear.