Three Koreans, driver killed in Egypt tourist bus blast
It did not state the cause of the blast. But two security sources said an explosive device planted either inside or near the bus was used.
Al Qaeda-inspired Islamist militants based in the largely lawless Sinai have stepped up attacks on security forces since army chief Abdel Fattah al-Sisi ousted elected President Mohamed Mursi of the Muslim Brotherhoodin July.
If militants were behind Sunday's attack, that would mark a shift in strategy to targeting tourists and economic targets and not just Egyptian police and soldiers.
State television showed a photograph of the bus. Its windows were blown out and the roof had been partially torn off. Plumes of black smoke billowed from the site of the explosion on a palm tree-lined boulevard.
Since he was deposed, Islamist militants based in the largely desolate Sinai near Israel have stepped up attacks on security forces, killing hundreds.
Mursi appeared in court on Sunday on charges of conspiring with foreign groups to commit terrorist acts in Egypt.
An explosion on a tourist bus in Egypt's Sinai near the Israeli border wounded four people, an army source said. Israeli policesaid they heard an explosion from the Egyptian side of the Taba border crossing.
Israeli police said they were preparing medics to treat any casualties from an explosion.
"The event is happening on the Egyptian side, and we are making our preparations," a police spokesman said.
Voice of Russia, Reuters