Police in the Nepalese capital, Kathmandu, have used batons to disperse student protesters who are demanding that their jailed leaders be released.
Witnesses say students retaliated by throwing bricks at police. At least six demonstrators were injured during Monday's skirmishes.
The student leaders were jailed for staging demonstrations against King Gyanendra's seizure of absolute power, and for demanding the restoration of democracy.
The king says he needed to seize full political power to curb corruption and quell a Maoist insurgency that has claimed more than 11,000 lives.
The rebels, who claim to be inspired by Chinese revolutionary Mao Zedong, have been fighting since 1996 to replace the constitutional monarchy in the world's only Hindu kingdom with a communist state.
Some information for this report provided by AP and AFP.