Hamas has denied reports that the group is close to finalising a deal with Israel over the release of Gilad Shalit, the Israeli soldier captured by Palestinian fighters more than three years ago.
Speaking on Al Jazeera on Sunday, Osama al-Mzainy, a senior Hamas leader who is responsible for the negotiations on Shalit, said that speculation over a deal was premature.
"All statements about the optimism and expectations - and that the deal will soon be sealed - all these statements are exaggerated," he said.
"We still need some time in order to overcome the obstacles placed by the Israelis."
Hamas has demanded the release of of 1,000 Palestinian prisoners held by Israel in exchange for Shalit.
"They will be released in two stages, al-Mzainy said.
"The first group will comprise 450 prisoners, whose names are determined by Hamas... In the second stage, 550 prisoners will be released. Hamas is attached to this plan.
"We will not accept any deal unless this request is accepted."
Among those that Hamas wants freed is Marwan Barghouti, a popular leader from the rival Fatah movement, a demand that is thought to be one of the stumbling blocks in negotiations.
Barghouti was arrested in the West Bank in April 2002, and is serving five life sentences in an Israeli jail.
In recent days, media reports had suggested the two sides were close to agreement.
Source: Al Jazeera (English)