"The response of the security forces to the protests is getting more and more violent. We are very troubled by the excessive and deadly use of force and the imposition of martial law in parts of Myanmar," they said.

"These incidents form part of a disturbing emerging pattern of systematic and widespread attacks against the civilian population of Myanmar, and those responsible should be held criminally responsible under international law."

States should consider applying the principle of universal jurisdiction to prosecute those responsible for acts that may amount to crimes against humanity, they added.

Also read: Deadly violence resumes in Myanmar after peaceful protests

Since last Friday at least 121 people have been killed by security forces in Myanmar. More than 2,400 people have been detained and the whereabouts of hundreds are unknown since the military rulers ousted the democratically elected government on February 1 this year.

Among the actions reported to the UN experts was a police and military raid last week lasting several hours in the Mingalar Taung Nyunt neighbourhood of Yangon, a compound housing around 960 employees of Myanmar Railways and their families.

Many of the railway staff and their families were forcibly evicted at gunpoint as punishment for their participation in a nation-wide general strike.

Also read: At least 138 peaceful protesters killed in Myanmar since Feb. 1: UN

"Forced evictions constitute a gross violation of the right to adequate housing and several other human rights. These actions must stop immediately," the experts said.

"Those affected must be allowed to return to their homes and property, and those responsible brought to justice."

There have also been reports of forced evictions in other parts of the country, including in Chin State (Hakka and Falam), Sagaing State (Homalin) and Shan State (Taungyyi).

Also read: Some Myanmar protests escape violence, but tensions remain

Also, the experts deplored the persecution and intimidation of pro-democracy protesters, including alleged arbitrary detentions, summary executions and killings of protesters.

"We call on the security forces to cease all violence against peaceful protests, and respect their right to peaceful protest," they said.