Military.com|by Bryant Jordan

A second veteran taking part in the Occupy Oakland protest is in a San Francisco hospital today after reportedly being beaten by police on Wednesday.

Kayvan Sabeghi, described as a former Army Ranger who served in Iraq and Afghanistan, is in intensive care at Highland Hospital in San Francisco, according to Reuters. Sabeghi is being treated for a lacerated spleen.

Former Marine Cpl. Scott Olsen is in the same hospital. He was brought there Oct. 25 after being struck in the head by a police-fired tear gas canister. Olsen is currently in fair condition and is expected to make a full recovery.

Iraq Veterans against the War, which along with Veterans for Peace has been supporting the Occupy movement in Oakland and elsewhere, said Sabeghi was detained by police late Wednesday during disturbances in downtown Oakland.

The group said Sabeghi was charged with resisting arrest and remaining present at the place of a riot.

KGO, the San Francisco ABC News affiliate, quoted Sabeghi’s sister as saying he was stopped by police, hit in the abdomen four times, and then arrested and jailed. Shoole Sabeghi told KGO that she spoke to her brother before he was taken into surgery at Highland.

"I am absolutely furious," she told KGO. "I'm absolutely furious at the way they treated my little brother. I'm so mad. They hurt him and then they refused to help him."

IVAW said in a statement that police struck him with nightsticks on his hands, shoulders, ribs and back and that he suffered from internal bleeding and a lacerated spleen.

Oakland Police did not respond to Military.com’s request for information on Sabeghi’s arrest.

Sabeghi is a partner in Elevation 66, a brew pub recently opened in East Bay.

After several days of generally peaceful demonstrations following the injury to Scott Olsen, violence broke out late Wednesday after -- according to a statement by Oakland Mayor Jean Quan -- some protesters occupied a building, set fires, and hurled explosives and other objects from the roof.

She said police arrested about 80 people.

The Occupy Oakland protests, one of many going on around the country and spurred by the Occupy Wall Street demonstration in New York City, briefly forced the shutdown of the Port of Oakland after thousands turned out following the hospitalization of Olsen last week.

“There's no doubt in my mind that the behavior of the Oakland police is infuriating more vets,” Mike Fermer, interim director for Veterans for Peace, told Military.com. “I hope [the protesters] will remain nonviolent and maybe the OPD will learn something.”