Israeli soldiers attacked protesters along the Syrian border with the occupied Golan Heights today, killing at least 23 protesters and wounding some 350 others. The protesters were marching to commemorate the 44th anniversary of the 1967 invasion of Golan.

The US State Department claimed to be “deeply troubled” by the protest march, and said that Israel had a right “like any sovereign nation” to defend itself by shooting protesters. Israeli opposition figures slammed “trigger-happy” soldiers for the large number of casualties.

Israel conquered the Golan Heights in 1967, along with the West Bank, East Jerusalem, the Gaza Strip and the Sinai Peninsula. Though Israel eventually returned the Sinai (with caveats) to Egypt, and simply walled in Gaza, they have ruled out leaving either Golan or the West Bank.