'Security Forces, Support Us,' protesters in Ahvaz chanted on January 2.
Iran's reformist politicians condemned violence that has rocked the country in recent days, accusing the United States of stirring unrest while still calling on their government to address economic grievances, AFP reported.
"Without doubt the Iranian people are confronted with difficulties in their daily lives... and have the right to peacefully demand and protest," said a January 2 statement from the Association of Combatant Clerics, headed by reformist ex-president Mohammad Khatami.
"But the events of recent days have shown that opportunists and trouble-makers have exploited the demonstrations to create problems, insecurity and destroy public buildings, while insulting sacred religious and national values."
The group said the violence seen through five days of protests across the country would help Iran's "enemies".
Judiciary official in Mashhad says 138 people have been so far arrested in the city.