Two guards of an anti-government protest movement were shot dead on Thursday and 21 other injured in two early morning attacks, medical officials confirmed.

Unidentified assailants in a pickup truck opened fire on protesters camped out near Democracy Monument in western Bangkok about 3 a.m. (8 p.m. GMT, Wednesday), killing two guards and wounding 19 people, the Erawan Emergency Centre said.

In a second attack, a grenade was thrown at the protesters’ street camp, injuring two more people, the centre said.

At least 24 people have died in protest-related violence since November 30, 2013, when the first confrontation between anti-government and pro-government followers occurred in the now six-month long demonstration aimed at toppling the administration.

Another 772 have been injured, the centre said.

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