RAMALLAH, West Bank — Israel sent more troops to the West Bank on Saturday, a day after a Palestinian stabbed to death three members of an Israeli family in their home and widespread Israeli-Palestinian clashes erupted over escalating tensions at the Holy Land’s most contested shrine.

The 20-year-old Palestinian assailant wrote in a pre-attack Facebook post that he planned to avenge what he called Israel’s “desecration” of the Jerusalem holy site.

Disputes over the shrine, revered by Muslims and Jews, have set off major rounds of Israeli-Palestinian confrontations in the past. They were also at the root of the current round that began last week when Arab gunmen fired from the shrine, killing two Israeli policemen.

In response, Israel installed metal detectors at the gates of the 37-acre walled compound, portraying the devices as a needed security measure to prevent more attacks.

Muslims alleged Israel was trying to expand its control at the Muslim-administered site under the guise of security – a claim Israel denies – and launched mass prayer protests.

On Friday, anger boiled over and several thousand Palestinians clashed with Israeli security forces in the West Bank and in Jerusalem after noon prayers, the highlight of the Muslim religious week. Three Palestinians were killed and several dozen wounded by live bullets in some of the worst street clashes in the past two years.