TEHRAN - Iran put 16 opposition supporters detained during anti-government protests last month on trial Saturday on charges of rioting and conspiring against the ruling system, Iran's state media reported. The official IRNA news agency and state Press TV said the defendants face charges ranging from plotting against the establishment to violating security regulations. Five of those on trial, including two women, were accused of "moharebeh," or defying God, a charge that could carry the death penalty, the semi-official ISNA news agency reported. The new prosecutions, coupled with the execution on Thursday of two men accused of involvement in anti-government groups, could mark an attempt by Iran's hardline leaders to intimidate the opposition ahead of a new round of street demonstrations expected in February. Those who stood trial Saturday ��" including a follower of the Bahai faith, an alleged communist and a student activist ��" were detained during anti-government demonstrations on Dec. 27, when at least eight people were killed and hundreds more were arrested after clashes between opposition activists and security forces. The violence was the worst since authorities launched a harsh crackdown immediately after Iran's disputed presidential election in June. The protesters have presented Iran's cleric-led establishment with its biggest challenge since the 1979 revolution despite a brutal crackdown that has left hundreds imprisoned. IRNA quoted a prosecutor identified only by the last name of Farahani as saying in court that some of the defendants had confessed to spying, planning bomb attacks and damaging public and private properties. He also said some of the defendants had sent videos on the clashes between protesters and Iranian police to the "foreign hostile networks," IRNA reported.