According to the sources, the blast was caused by a home-made bomb that went off as a bus was passing by, leaving two passengers wounded.
No group claimed responsibility for the attack, the latest of a series of minor bombings that hit the Suez Canal province over the past three days.
Egypt has been dogged by turmoil since the military ousted elected President Mohamed Morsi in mid-2013 following massive protests against his rule.
Egyptian authorities often blame the outlawed Muslim Brotherhood, the group from which Morsi hails, for attacks mostly targeting security forces in recent months.
The Brotherhood denies the accusations and says it is committed to peaceful activism.