"There are people who want this dialogue not to take place because they will lose their positions and their privileges," he told Reuters in an interview in the Egyptian town of Ismailia, where he was visiting his wife's Egyptian relatives.

Zahar repeated Hamas complaints that the Fatah movement, which dominates the Palestinian Authority, has detained dozens of Hamas members in the West Bank in the past week. "These matters (the arrests) do not serve dialogue," he added.

The arrests have added to the tension between the two largest Palestinian groups during preparations for the dialogue.

Zahar, who was Palestinian foreign minister in the government Hamas formed after winning elections in 2006, said U.S. intervention was behind the tension. "There are U.S. (intelligence) agencies working in the West Bank," he added.

He also rejected Fatah complaints about arrests by Hamas in Gaza, where the Islamist movement is in control.

"We have published pictures of what they call political detainees in Gaza. These are people who have confessed that they provided the enemy (Israel) with information about where fighters were stationed and the tunnels (to Egypt) and the type of weaponry," he said.

Zahar said Hamas had asked the Egyptian government to let it import 1,000 containers into Gaza for use as temporary housing for Palestinians displaced during Israel's three-week assault on the coastal strip, which ended in mid-January.

A group of Hamas engineers arrived in Cairo on Monday to study the purchase of the 1,000 containers.

Hamas has also asked Egypt to press Israel to let wood, glass, aluminium, steel and electrical supplies into Gaza to rebuild what was destroyed in the offensive, he said.

Israel has restricted supplies of building materials to Gaza, saying some of them might help Hamas rearm and earn the movement credit with Palestinians living in Gaza.

Zahar declined to give any commitment that Hamas would cooperate with U.S. and Israeli attempts to stop the movement receiving money and weapons from abroad.

"It's our right to bring in everything -- money and arms. We will not give anyone any commitment on this subject," he said.