Hamas leaders are claiming that their execution of two "collaborators" last month has resulted in many others turning themselves in out of fear.
A Gaza interior ministry spokesman said that Gazans have been surrendering to Hamas, and that Israel is using experts in psychology to target weak spots in vulnerable people to entice them to be spies. He also warned again about how Israel is using social networking sites to communicate with potential agents.
Another article talks about others who have been caught by Hamas, with a picture of what is alleged to be a secret radio transmitter and a map.
I am not sure why radios make sense nowadays when Gazans can easily use Skype or other encrypted Internet methods to securely talk with their Israeli handlers.