Palestinian President Mahmoud Abbas has fired three top security officials after militants broke the ceasefire he reached with Israel and fired mortars at Jewish settlements in the Gaza Strip. Mr. Abbas dismissed the men, including security chief Abdel Razek Majaidie, hours after Hamas militants fired the mortars. No one was wounded in the shelling, which Hamas said was a response to Israeli gunfire that killed a Palestinian man Wednesday in Gaza. Despite the violence, Israeli and Palestinian officials met late Thursday to discuss security issues. Meanwhile, a deadly shootout was also reported at a Palestinian jail in Gaza City. Palestinian sources say at least three people described as Israeli collaborators were killed when dozens of masked gunmen stormed a jailhouse and set free several prisoners.