Israeli security forces on Wednesday arrested two Palestinian activists and two foreign supporters who were in the city of Hebron for a conference on popular struggle, police said.
"They attacked police who tried to disperse them and they are currently being questioned," police spokeswoman Luba Samri told AFP.
She said that they were part of a group which assembled near a flashpoint religious site in city's Israeli-controlled sector, known as the Cave of the Patriarchs to Jews and the Ibrahimi Mosque to Muslims.
"They shouted slogans and started staging an unauthorised protest," she said.
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They were visiting the southern West Bank city as part of a field trip on the second day of the Bilin 7th Annual Conference on Popular Struggle, which examines the growth of peaceful protest in the Palestinian territories.
A spokeswoman for the conference, Abir Kopty, said that initially eight Palestinians and four Europeans were detained but most were later released.
She said that the two foreigners still in custody on Wednesday evening were Italians, but she could give no further details.
The conference began on Tuesday in Bilin, a West Bank village near Ramallah which has for several years been waging a weekly struggle against the route of Israel's vast separation barrier, which cuts through the villagers' land.