- Hong Kong police areengaged in running battles

with hundreds of protestors trapped

at the city's PolytechnicUniversity today.

As a ring of police tightens around them

protestors are fightingwith everything they have.

They use catapults againstriot police in armored vehicles

setting at least one armored car on fire.

One police official was hitin the leg with an arrow

in some of the worst fightingsince the protest began.

For days protestors havebarricaded the campus

to keep police from getting in.

Now cornered by authorities,they're trying to get out.

Hong Kong Police are callingon protestors to surrender

and face justice, butprotestors were washing wounds

and preparing more Molotovcocktails early today

getting ready for more combat.

This protestor said, "We are exhausted

"because we were up since5:00 a.m. yesterday.

"We're desperate because oursupplies are running low."

Now after the arrival ofmainland Communist Chinese troops

to Hong Kong streets for the first time,

China's Global Times newspaper

says police should usesnipers with live ammunition

at violent protestors.

In this press briefing,the choice of words

sounded like police werepreparing the public

for a much more violent crackdown.

- The development, so violencehas reached a critical level,

rioters are so intent tomurder our officer at all cost.

- Hong Kong Polytechnic's president said

in a statement studentswould be allowed to surrender

without further violence,but must also be arrested.

The protest startedpeacefully in early June

sparked by a proposed law

that would've allowed criminal suspects

to be extradited to the mainland.

Now after six months, theprotestors are tempting Beijing

to crush an insurrectionthat would never be allowed

in mainland China.

Recently discovered Chinese documents show

that Chinese leader Xi became a hardliner

after seeing the collapseof the Soviet Union,

which he blamed on weakleadership and a lack of resolve,

not a good sign for protestors.

Dale Hurd, CBN News.