*Two Chinese factories reported set ablaze
Security forces killed at least 22 anti-coup protesters in the poor, industrial Hlaingthaya suburb of Myanmar's main city  Sunday after Chinese-financed factories were set ablaze there, an advocacy group said.
A further 16 protesters were killed in other places, the Assistance Association for Political Prisoners (AAPP) said, as well as one policeman, making it the bloodiest day since the Feb. 1 coup against elected leader Aung San Suu Kyi.
The Chinese embassy said many Chinese staff were injured and trapped in arson attacks by unidentified assailants on garment factories in Hlaingthaya and that it had called on Myanmar to protect Chinese property and citizens.
As plumes of smoke rose from the industrial area, security forces opened fire on protesters in the suburb that is home to migrants from across the country, local media said.
"It was horrible. People were shot before my eyes. It will never leave my memory," said one photojournalist on the scene who did not want to be named.
Martial law was imposed in Hlaingthaya and another district of Yangon, Myanmar's commercial hub and former capital, state media announced.
Army-run Myawadday television said security forces acted after four garment factories and a fertiliser plant were set ablaze and about 2,000 people had stopped fire engines from reaching them.
A junta spokesman did not answer calls requesting comment.
Doctor Sasa, a representative of elected lawmakers from the assembly that was ousted by the army, voiced solidarity with the people of Hlaingthaya.
"The perpetrators, attackers, enemies of the people of Myanmar, the evil SAC (State Administrative Council) will be held accountable for every drop of blood that shed," he said in a message.
The latest deaths would bring the toll from the protests to 126, the AAPP said.
It said more than 2,150 people had been detained by Saturday.
China's embassy described the situation as "very severe" after the attacks on the Chinese-financed factories.
It did not make a statement about the killings.
"China urges Myanmar to take further effective measures to stop all acts of violence, punish the perpetrators in accordance with the law and ensure the safety of life and property of Chinese companies and personnel in Myanmar," its statement said.
No group claimed responsibility for burning the factories.
Anti-Chinese sentiment has risen since the coup that plunged Myanmar into turmoil, with opponents of the army takeover noting Beijing's muted criticism compared to Western condemnation.
Only two factories had been burnt for now, protest leader Ei Thinzar Maung posted on Facebook.
"If you want to do business in Myanmar stably, then respect Myanmar people," she said."Fighting Hlaingthaya, we are proud of you!!"
Britain was appalled by the use of deadly force by security forces against innocent people in Hlaingthaya and elsewhere , its ambassador said in a statement.
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