By Tsegaye Tadesse

ADDIS ABABA (Reuters) - Ethiopian security forces on Tuesday beat rock-throwing students protesting the results of elections they say were rigged in a second day of violence that has left one person dead and seen hundreds arrested.

About 100 students at a technical college tried to go into the streets to protest but were forced to stay inside their campus by riot police and paramilitary soldiers, witness Sao Okutsu told Reuters.

The students began throwing rocks, which still littered the streets outside the school near the city's Mexico Square, prompting the security forces to storm the campus and force the students to the ground, Okutsu said.

"Students sitting on the ground in the campus were being beaten harshly by the police," Okutsu, a drafting teacher at the college, told Reuters before police hurried him away.

At least one person was injured and rushed to the hospital, he said.

The disturbance followed a demonstration that turned violent on Monday at Addis Ababa University, where one person was killed and more than 500 arrested.

Students had protested the results from a May 15 parliamentary poll they said was manipulated by the ruling Ethiopian People's Revolutionary Democratic Front (EPRDF) of Prime Minister Meles Zenawi.

Police have been deployed at strategic areas throughout the city. Near the technical college, security forces carrying machine guns blocked roads with armoured cars and kept pedestrians and journalists away from the school.

The protests have come despite a month-long ban on public demonstrations the government imposed after the polls.

Tensions have been rising in Africa's top coffee grower since then, with the opposition accusing the ruling party of intimidation and vote rigging to stay in power.

The EPRDF blamed the opposition Coalition for Unity and Democracy (CUD) for instigating the demonstrations, which the CUD denied.