Ismail Haniya, left, the top official of the Hamas government talks to a student during final exams at a school in Gaza City, Monday, June 8, 2009. Israeli troops killed four Palestinian gunmen early Monday in a flare-up of violence along the tense frontier between Israel and Hamas-controlled Gaza, a Palestinian official said. Haniyeh, praised the militants as "martyrs" and said the violence confirmed Israel's "aggressive intentions" toward the Palestinians.