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An Egyptian intelligence official on Thursday denied allegations leveled by Hamas that Egypt pumped gas into a cross-border tunnel used to smuggle goods into the Gaza Strip, killing four Palestinians.Egypt has been under pressure to shut down the hundreds of tunnels that are a key economic lifeline for the Palestinian territory but which are also used to bring in weapons for Hamas.The intelligence official confirmed that Egyptian security forces destroyed the entrances to several tunnels this week, but said that no gas was used in the operations. He said that Egypt routinely blows up the mouths to the tunnels to seal them off, and that the blast and an ensuing fire could quickly use up all the oxygen in the confined space, causing people caught inside to suffocate.RELATED:

Hamas reopens smuggling tunnels Egypt's denial comes a day after Hamas accused Egyptian forces of killing four Palestinians by pumping gas into a smuggling tunnel. The Hamas Interior Ministry said in a statement late Wednesday that the gas used to try to clear the tunnel was poisonous. It said six people were also injured.It was not immediately clear what evidence Hamas was basing its allegations on.Mohammed al-Osh, the medical director of the Abu Yusef al-Najar hospital in the Gaza border town of Rafah where some of the dead and injured were taken, could not confirm those killed had inhaled poison gas. He said the hospital did not have the equipment or specialists needed to conduct the necessary tests on lungs and clothing.Palestinian officials in Rafah say Egypt has stepped up a crackdown on smuggling in recent months, blowing up numerous tunnel entrances on its side of the border, setting up checkpoints in the area and confiscating contraband. Since December, Egypt has also been building an underground steel wall to block the tunnels.Rafah officials have said about four miles (six kilometers) of that barrier — covering roughly half of the border area — is already complete.