A protester is detained in Central district of Hong Kong on Monday, Nov. 11, 2019. A Hong Kong protester was shot by police…
A protester is detained in Central district of Hong Kong on Monday, Nov. 11, 2019. A Hong Kong protester was shot by police Monday in a dramatic scene caught on video as demonstrators blocked train lines and roads during the morning commute.

Hong Kong Chief Executive Carrie Lam says protesters who threw Tuesday's rush hour commute into chaos by erecting barricades on roads and subway tracks were "extremely selfish."

The actions marked another day of violent protests and disturbances in the Chinese territory that had been previously confined to the weekends over the past five months. Dozens of passengers aboard a commuter rail line were forced to exit the train when it stopped short of the station.  

The unrest also reached onto Hong Kong's college campuses Tuesday, with riot police firing tear gas at protesters who erected barricades at roads at both Hong Kong University and the Chinese University of Hong Kong.  

Thousands of protesters staged a "flash mob" demonstration in the city's central business district at midday, chanting "five demands, not one less, a reference to their demands for democracy, an independent probe into allegations of police brutality and other issues.

Tensions have escalated in Hong Kong after a policeman shot a 21-year-old protester Monday as he was physically struggling with another protester he was attempting to arrest.  The city's hospital authority says the protester was in critical condition.  A man set on fire after he was doused with gasoline in a separate incident is also in critical condition.  

Lam denounced the violence Monday, telling protesters it is "wishful thinking" that the Hong Kong government will give into protesters "so-called political demands" in order to quell the violence.  

The protests were initially sparked by a proposed extradition bill that would have allowed criminal suspects to be sent to mainland China to face trial, but have since evolved into demands for full democracy for Hong Kong.  More than 3,000 people have been arrested since the demonstrations erupted

U.S. State Department spokeswoman Morgan Ortagus issued a statement Monday condemning "violence on all sides" and urged "all parties -- police and protesters -- to exercise restraint."