The explosions came after a few months' lull in violence in Sinai, which witnessed a surge in insurgent attacks following the military's ouster last July of Islamist President Mohammed Morsi. The military removed Morsi after millions of Egyptians rallied against his rule, a year after his election, and demanded he step down.
Today's attacks took place shortly after dawn in the town of el-Tor in the south of the peninsula. In the first attack, the bomber targeted an army checkpoint, killing one soldier and wounding five, the officials said. The second bomber stepped out on a road and blew himself up in front of a bus. Four passengers were wounded from that explosion.
No one immediately claimed responsibility for Friday's attacks.
In October, a suicide car bomb attack on the security headquarters in el-Tor killed three policemen and wounded 55.
That attack was later claimed by an al-Qaida-inspired group, Ansar Beit al-Maqdis, or the Champions of Jerusalem, which has also claimed responsibility for many of the explosions targeting the military and security forces across Egypt in recent months.
Ansar Beit al-Maqdis has said its attacks are in revenge for the killings of protesters, who have been staging near-daily demonstrations demanding Morsi's reinstatement.
Egypt's interim, military-backed government has branded the Muslim Brotherhood, a group from which Morsi hails, as a terrorist organisation. The Islamist group denies any link to violence and the attacks in the country.
