Gaza's Hamas rulers announced a new campaign to find Palestinian collaborators with Israel.

Col. Mohammed Lafi of Gaza's Interior Ministry said Monday that the campaign aims to protect armed Palestinian groups battling Israel. Lafi says they will also warn other Palestinians of the dangers of spying.

Israel security officials have long relied on a network of informants in the Palestinian territories to keep tabs on terrorist activity.

Since Hamas seized power in Gaza in 2007, it has taken a tough line on Palestinians accused of collaboration with Israel. Gunmen have killed more than 24 suspected collaborators, and jailed 20 suspects.

A Palestinian rights group urged Hamas to ensure fair trials for the accused.

Lafi says the campaign, which includes TV ads and offers of amnesty, will begin on Wednesday.