Reuters wrote An ultra-Orthodox Jewish man stabbed and wounded six participants, two of them seriously, in the annual Gay Pride parade in Jerusalem on Thursday, with police saying the suspect was jailed for a similar attack 10 years ago.

About 5,000 people celebrating the event were marching along an avenue when a man jumped into the crowd, apparently from a supermarket, and plunged a knife into some of the participants, witnesses said.

"We heard people screaming, everyone ran for cover, and there were bloodied people on the ground," Shai Aviyor, a witness interviewed on Israel's Channel 2, said.

Police said they arrested the suspected perpetrator, an ultra-Orthodox man. Spokeswoman Luba Samri said he was the same assailant jailed for the stabbing of three marchers at a similar Jerusalem event in 2005. Israeli media said the suspect had been released from prison several weeks ago.

Police and medics said the attacker wounded six people. Two were taken to hospital in serious condition, including a young woman, said a doctor at Shaarei Tzedek Hospital, where the victims were being treated.

Prime Minister Benjamin Netanyahu called it "a despicable hate crime", and President Reuven Rivlin warned that social intolerance could spell disaster for Israel.

Netanyahu said Israel would prosecute those responsible to the full extent of the law, adding: "Freedom of individual choice is a basic value in Israel."