UPDATE 11-Hong Kong violence prompts reminder that China troops close at hand

* Video shows protester shot at close range

* 'There was three sounds, like pam, pam, pam' - resident

* Anti-government protests now entering sixth month (Adds Mong Kok clashes, paragraphs 24-25)

By James Pomfret and Clare Jim

HONG KONG, Nov 11 (Reuters) - Hong Kong police shot and critically wounded a protester and a man was set on fire on Monday in violence that prompted leader Carrie Lam to denounce "enemies of the people" and drew a chilling warning from a senior Chinese newspaper editor.

Protesters threw petrol bombs at police after a weekend of clashes across the Chinese-ruled territory, marking a dramatic escalation in more than five months of often violent pro-democracy unrest.

"The violence has far exceeded the call for democracy and the demonstrators are now the people's enemy," Hong Kong chief executive Lam said in a defiant televised address.

"If there's still any wishful thinking that by escalating violence, the Hong Kong ... government will yield to pressure, to satisfy the so-called political demands, I'm making this statement clear and loud here: that will not happen."

Police fired tear gas in the narrow streets of the Central business district where some protesters, crouching behind umbrellas, blocked streets as office workers crowded the pavements and hurled anti-government abuse.

Some passersby took cover inside the Landmark mall, one of the oldest and most expensive, as volleys of tear gas rained down.

There have been almost daily protests in Hong Kong, but it was rare for tear gas to be fired during working hours in Central, lined with bank headquarters and top-brand shops. Some offices closed early.

China has a garrison of up to 12,000 troops in Hong Kong who have kept to barracks throughout the unrest, but it has vowed to crush any attempts at independence, a demand for a very small minority of protesters.

The editor in chief of China's Global Times tabloid, published by the state-owned People's Daily, said Hong Kong police had nothing to be scared of.

"You have the backing of not only Hong Kong and Chinese people, but also Chinese soldiers and People's Liberation Army in Hong Kong," Hu Xijin wrote on his blog. "They can go into Hong Kong to provide support at any time."

SHOOTING CAUGHT ON VIDEO

Police fired live rounds at close range at protesters in Sai Wan Ho on the eastern side of Hong Kong island and one 21-year-old protester was wounded. Police said the victim was in critical condition.

Resident Anson Yip, 36, said protesters were building a road block when police ran to the scene.