CAIRO  Iranian officials have sentenced to death three protesters who participated in demonstrations following the nation’s disputed presidential election in June, according to ISNA, Iran’s semiofficial news agency.

The news service quoted an unnamed spokesman for the Tehran prosecutor’s office saying that the three were sentenced to be hanged and that they had been part of what Iran considered terrorist organizations.

The death sentences are the first to be made public in cases involving the hundreds charged in the vast protests that followed the government’s declaration of a landslide victory for the incumbent, Mahmoud Ahmadinejad, in the June 12 presidential election.

Reform-aligned Web sites reported last week that a prisoner named Mohammad-Reza Ali-Zamani had received a death sentence. The announcement on Saturday, which said a man with the initials M. Z. would be put to death, appears to confirm that sentence and report two others.