Fifteen Israeli Navy sailors were injured Friday when a fire broke out aboard a Dvora-class patrol ship operating off the coast of the Gaza Strip.

Two of the sailors were moderately injured and the remainder lightly injured when a fire erupted below decks, Channel 2 reported. Most suffered from smoke inhalation. The men were taken to hospitals across southern Israel for treatment and were expected to be released home later on Friday.

Damage was caused to the ship.

The navy opened an investigation into the incident in order to determine the cause of the fire. According to Channel 10, an initial investigation found that the fire started because of a malfunction of one of the ship’s pumps.

Earlier in the week one of the Israeli Navy’s missile ships overturned approximately a mile off the coast of Ashkelon. No sailors were injured in the incident.