Protesters in Hong Kong attack with arrows and petrol bombs

Sunday morning in Hong Kong began as Saturday ended - with clashes between protesters and police.

Protesters, mainly students, occupied the city's polytechnic university where Sunday's early clashes took place.

"We don't want to attack the police, we just want to protect our area here at the university, and we want to protect Hong Kong," says Chan, a student at the scene.

Images from the university area show how protesters, during a confrontation with the police, shoot with a bow and use giant homemade snake bells to fire petrol bombs.

A police officer working in the press department was hit in the wad by an arrow, according to Hong Kong police.

The university is at least the fifth in Hong Kong that has been occupied by protesters for periods. Polytechnic University is close to the main road tunnel connecting Hong Kong Island with the rest of the city. Blocking traffic in the tunnel, and thereby disrupting Hong Kong's infrastructure and economy, is one of the protesters' goals.

According to the South China Morning Post, Sunday's clashes began when protesters threw stones at residents of the city trying to clear away pebbles near the university and the tunnel.

Saturday's clean-up maneuver, when the Chinese army sent soldiers on the streets of Hong Kong to clear barricades and debris from the huge protests held in the city, was seen by many protesters as a demonstration of power and a warning from Beijing. Saturday night became uneasy in the city, and unrest continued well into the night into Sunday.

A call on social media urges protesters to increase pressure on local government on Monday. "Get up early, target the regime, push the economy to increase the press," the call states.