Thailand's army chief says the military will not intervene with force in the country's crisis, as the death toll from a blast in Bangkok rose to three.
Thailand's political crisis has become increasingly violent since mass protests began in November.
On Sunday, an apparent grenade blast near an anti-government protest site killed a woman and a four-year-old boy.
Doctors said on Monday that the little boy's sister died later of brain injuries.
Twenty-two people were hurt in Sunday's blast, including a nine-year-old boy who is in intensive care.
Sunday's attack came hours after gunmen opened fire on an anti-government rally in eastern Thailand, killing a five-year-old girl.
Thai Prime Minister Yingluck Shinawatra has condemned the attacks, describing them as 'terrorist acts for political gain'.
UN Secretary Ban Ki-moon has also spoken out, calling for violence 'from any quarter' to end immediately.
There has been continued speculation that the military might step in after three months of protests in Bangkok, the BBC's Jonathan Head in Bangkok reports.
However, on Monday, army chief Prayuth Chan-ocha said that the military would not intervene with force. Instead, it would deploy troops to provide protection to people.
'Somebody has to take responsibility but that doesn't mean soldiers can intervene without working under the framework [of the law].