Hers is the first confirmed death among the protesters who by the thousands have faced off with security forces after a junta took power Feb. 1, detained Myanmar’s elected leaders and prevented Parliament from convening.

Mya Thwet Thwet Khine, 19, was shot during a demonstration in the capital Naypyitaw on Feb. 9. Video showed her sheltering from water cannons and suddenly dropping to the ground after a bullet penetrated a motorcycle helmet she had been wearing. She had been on life support at a hospital with what doctors had said was no chance of recovery.

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Her brother, Ye Htut Aung, who spoke to The Associated Press from a mortuary, said she died at 11:05 a.m. Friday. A source at Naypyitaw's 1000-Bed General Hospital, speaking on condition on anonymity because of fear of harassment from the authorities, confirmed her death.

A spokesman for the ruling military did not deny the woman had been shot by security forces, but said at a news conference this week that she was one of the crowd that had thrown rocks at police and the case was under investigation. There were no independent accounts of her taking part in any violence.

Protesters had already hailed Mya Thwet Thwet Khine as a hero and commemorated her during demonstrations earlier this week. News of her death is likely to inflame passions even more in the nonviolent protest movement, which embraces civil disobedience.

Demonstrations continued Friday in Yangon, the country’s biggest city, and elsewhere.

Security forces so far have been relatively restrained on confronting protesters in Yangon, but appeared to be toughening their stance in locations where there is less media presence.

Police used force for a second straight day to arrest protesters in Myitkyina, the capital of the remote northern state of Kachin. The Kachin ethnic minority has long been at odds with the central government, and there has been intermittent armed struggle against the army there for decades.

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On Thursday night in the southeastern city of Dawei, local media reported that several people were wounded by rubber bullets when police staged nighttime raids to try to arrest some activists. Large but peaceful protest marches have taken place in the city, with negotiations between the demonstrators and the authorities to avoid confrontations.

Tom Andrews, the independent U.N. human rights expert on Myanmar, told The Associated Press this week that the initial restraint of police dealing with “robust citizen opposition to the coup” has moved in some instances to use of rubber bullets, real ammunition and water cannons.

Speaking from the United States, he also said “hardened” troops were being deployed from border areas to some cities, raising the possibility of bloodshed and “a tragic loss of life.”

The junta has said it took over — after detaining the nation's leader Aung San Suu Kyi and others and preventing Parliament from convening — because elections last November were tainted by voting irregularities. The election outcome, which Suu Kyi’s party won by a landslide, was affirmed by an election commission that has since been replaced by the military. The junta says it will hold new elections in a year’s time.

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The U.S., Britain and Canadian governments have imposed sanctions on Myanmar's new military leaders, and they and other governments have called for Suu Kyi's administration to be restored.

The coup was a major setback to Myanmar’s transition to democracy after 50 years of army rule. Suu Kyi come to power after her National League for Democracy party won a 2015 election, but the generals retained substantial power under the constitution, which was adopted under a military regime.