The incident took place at the Alonei Shilo outpost which lies about 10 kilometres (six miles) southwest of the city of Nablus, she said.
"The authorisation was given for three caravans to be taken to the (nearby) Karnei Shomron settlement but they tried to take them to Alonei Shilo," the source explained, saying troops had managed to stop two of the caravans en route.
A third caravan, however, was successfully established on the site.
The three caravans were to serve as a synagogue for the sizeable outpost which, according to the settlement watchdog Peace Now, was established before Israeli Prime Minister Ariel Sharon (news - web sites) came to power in 2001.
Public radio said the officers confiscated two caravans, three transporters and a crane.
According to a report on the website of Israeli daily Haaretz, police and soldiers spent hours trying to remove the third caravan from the outpost but were prevented by the settlers.
Meanwhile, Internal Security Minister Tsahi HaNegbi met with Jewish settlers and activists from the right-wing Likud party at the unauthorized Migron outpost just east of Ramallah, Haaretz said.
During the visit, HaNegbi said it was important to get ready to prevent the removal of both authorised settlements and rogue outposts, the report said.
"It is a big danger. The problem is that the programme is being run by 'our man', and the question is how we struggle against (that)," he said, referring to Israeli leader Ariel Sharon who has long been referred to as the "father" of the settlement movement.
In December, Sharon said Israel would implement a unilateral plan for disengagement from the Palestinians if they did not start implementing the US-backed Mideast peace roadmap.
Part of the controversial plan would see Israel evacuating 17 Jewish settlements in the Gaza Strip (news - web sites) and several others in the West Bank while strengthening Israel's control over other larger West Bank settlements.
Under the faltering international "roadmap" for resolving the Middle East conflict, Israel is supposed to demolish settlement outposts and end expansion of the existing settlements it has authorised.
Peace Now says there are 102 unauthorized settlement outposts in the West Bank, 55 of which have been established since Sharon came to power and another three which have been set up since the "roadmap" peace process was launched in June last year.
The United Nations (news - web sites) views all settlements on occupied Palestinian land as illegal.
