Jerusalem —

The security camera pointed at the entrance of Channel 12’s Tel Aviv headquarters captured the attack in all its simple brutality. A masked man ran toward the glass door of Israel’s most-watched television channel and shattered it with a brick.

“Next time, the brick will be aimed at one of your heads,” read an anonymous letter left at the scene, naming dozens of public figures. The letter included a warning: “In the end someone will die.”

Tuesday’s attack was at least the third act of vandalism against an Israeli media outlet within a month and the latest in an escalating pattern of threats, graffiti and intimidation aimed at journalists, unfolding less than three months before Israel’s October elections.

“Someone who throws a stone at a glass door will throw it at a person’s head,” said Channel 12’s main anchor Danny Kushmaro earlier in July. “Someone will die,” he warned.