An Italian pro-Palestinian activist has been found dead in the Gaza Strip hours after being abducted, security sources in the Hamas-governed territory say.
Vittorio Arrigoni was seized by a radical Islamic group on Thursday morning and video of him blindfolded with tape was later posted on YouTube.
Hamas police reportedly found his dead body inside a house.
Mr Arrigoni was the first foreigner kidnapped in Gaza since BBC journalist Alan Johnston was snatched in 2007.
Italian consular officials earlier confirmed that he had been abducted.
It is thought he was kidnapped by Salafist radicals, who have often been in conflict with Hamas, the BBC's Gaza correspondent Jon Donnison says.
They consider Hamas, an Islamist movement itself, too moderate, our correspondent says.
In the video posted on YouTube, the kidnappers demand that Hamas release a number of Salafist prisoners.
Mr Arrigoni's eyes are covered with what looks like thick black tape.
The Italian man had been in Gaza for several years.
Hamas had been credited with eliminating the threat of kidnapping in Gaza until his abduction.