Occupied Jerusalem/Gaza: Dr Baruch Mandeltzwieg knelt down and ripped open the jacket of a critically wounded man from yesterday's suicide bombing in Dimona to begin emergency treatment.

But instead of finding gushing blood, he was struck by another sight - an explosive belt.

The wounded man turned out to be a second suicide bomber who was knocked out by the force of the initial blast before he was able to detonate his own explosive belt.

"His head was moving. He was a patient who could be treated," Mandeltzwieg told Israel's Army radio. "We started to treat him and then we saw an explosive belt ... I managed to see a small gas canister and small plastic bags attached to his body."

Mandeltzwieg ran away as the second bomber began waving his arms.

An Israeli policeman then shot the bomber, police spokesman Micky Rosenfeld said.

"This is the first time this has happened in Dimona," says Meir Cohen, the mayor of the town with a 40,000-strong population.

Palestinian shot dead

The terrified residents are certain they know how the two bombers got into Israel to carry out the first suicide attack inside the Jewish state in a year. The attackers must have crossed into Israel through Egypt's Sinai desert, a mere 80km away, following a nearly two-week breach in the border between the Hamas-run Gaza Strip and Egypt, they say.

On Monday, A Palestinian was shot dead and six people were wounded, including three Egyptian policemen, in an exchange of fire after the Gaza-Egypt border was sealed, medics and witnesses said.