At least seven people have been injured when unknown gunmen opened fire on anti-government demonstrators in the protest-hit Thai capital, Bangkok.
One person is in a critical condition after the attacks on the main rally site - a day after six were injured in clashes between rival groups.
The opposition has been campaigning to overthrow Prime Minister Yingluck Shinawatra since last November.
Protesters want to block next month's snap election.
Protest leaders are planning a total shutdown of the capital on Monday, and the army and police say they are concerned there will be further violence.
Army chief Gen Prayuth Chan-Ocha said on Saturday: "I want to urge all sides and everybody, please don't clash and fight. We're all Thais. We can think differently but we cannot kill each other."
A liberal’s disagreement with a socialist or social democrat comes down to this: we both seek equality, but the only equality a liberal thinks is worth striving for is an equality of freedom. A liberal’s disagreement with conservatives comes down to this: we both seek freedom, but a liberal believes no one can achieve it alone. There is such a thing as society, and government’s purpose is to shape a society in which individual freedom can flourish. (Michael Ignatieff)