Hong Kong Chief Executive Carrie Lam speaks during a press conference in Hong Kong, Monday, Nov. 11, 2019. A protester was shot by police Monday in a dramatic scene caught on video as demonstrators blocked train lines and roads in a day of spiraling violence fueled by demands for democratic reforms. (AP Photo/Dita Alangkara)

HONG KONG (AP) — The Latest on Hong Kong protests (all times local):

6 p.m.

Hong Kong's leader says her administration will "spare no effort" in bringing an end to anti-government protests that have wracked the city for more than five months.

Carrie Lam spoke to reporters Monday during a day of spiraling violence that included the shooting by police of an unarmed protester and the setting on fire of a man during an argument over national identity.

Lam said she did not want to go into details, but her comments are likely to fuel speculation that harsher legal and police measures may be in the works.

Lam also said there would be no giving way to protesters' demands for political concessions.

"If there is still any wishful thinking that, by escalating violence, the Hong Kong SAR government will yield to pressure to satisfy the so-called political demands, I am making this statement clear and loud here: That will not happen," Lam said, using the initials for Special Administrative Region, which describes the city's status as a semi-autonomous Chinese territory.

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3:30 p.m.

A man has been set on fire following an apparent dispute over national identity in Hong Kong, where police shot a protester on a day of escalating violence.

The man set on fire around midday was in critical condition in a city hospital. Video posted online show him arguing with a group of young people, before someone douses him with a liquid and strikes a lighter.

The police shooting was also captured on video Monday as demonstrators blocked train lines and roads during the morning commute to push their demands for democratic reforms. The Hong Kong hospital authority said the person shot was in critical condition.

The violence is likely to further inflame passions after a student died Friday from injuries suffered in an earlier fall and police arrested six pro-democracy lawmakers over the weekend.

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10 a.m.

A video posted online in Hong Kong shows police shooting at least one protester as demonstrators disrupted the morning rush hour.

A police officer collars one protester and then shoots another who approaches in the video posted on Facebook on Monday by online video outlet Cupid Producer.

The shooting occurred in a crosswalk at a large intersection strewn with debris that had backed-up traffic.

The officer also fires at a third protester who approached. It was unclear if the protester was hit.

A protester approaches a gas canister deployed in Central district of Hong Kong on Monday, Nov. 11, 2019. A protester was shot by police Monday in a dramatic scene caught on video as demonstrators blocked train lines and roads during the morning commute. (AP Photo/Vincent Yu)
Protesters with umbrellas and bottles of water to douse tear gas canisters form up during confrontation with police in Hong Kong on Monday, Nov. 11, 2019. A protester was shot by police Monday in a dramatic scene caught on video as demonstrators blocked train lines and roads during the morning commute. (AP Photo/Vincent Yu)
A protester is detained in Hong Kong Monday, Nov. 11, 2019. Hong Kong is in the sixth month of protests that began in June over a proposed extradition law and have expanded to include demands for greater democracy and other grievances. (AP Photo/Kin Cheung)
Police cordons off the scene of a morning shooting in Hong Kong Monday, Nov. 11, 2019. Police in Hong Kong were filmed shooting at least one protester and possibly a second on Monday as demonstrators blocked subway lines and roads during the morning commute. (AP Photo/Kin Cheung)
Police cordons off the scene of a morning shooting in Hong Kong Monday, Nov. 11, 2019. Police in Hong Kong shot a protester as demonstrators blocked subway lines and roads during the Monday morning commute. (AP Photo/Kin Cheung)
A woman reacts after being pepper sprayed by police in Hong Kong Monday, Nov. 11, 2019. Police in Hong Kong were filmed shooting at least one protester and possibly a second on Monday as demonstrators blocked subway lines and roads during the morning commute. (AP Photo/Kin Cheung)
Police cordons off the scene of a morning shooting in Hong Kong on Monday, Nov. 11, 2019. Police in Hong Kong were filmed shooting at least one protester and possibly a second on Monday as demonstrators blocked subway lines and roads during the morning commute. (AP Photo/Kin Cheung)
Police clean up a street after protesters try to block roads in Hong Kong Monday, Nov. 11, 2019. Police in Hong Kong were filmed shooting at least one protester and possibly a second on Monday as demonstrators blocked subway lines and roads during the morning commute. (AP Photo/Kin Cheung)
Police cordons off the scene of a morning shooting in Hong Kong Monday, Nov. 11, 2019. Police in Hong Kong were filmed shooting at least one protester and possibly a second on Monday as demonstrators blocked subway lines and roads during the morning commute. (AP Photo/Kin Cheung)
A man with his face covered in pepper spray walks down a street of Hong Kong Monday, Nov. 11, 2019. Hong Kong is in the sixth month of protests that began in June over a proposed extradition law and have expanded to include demands for greater democracy and other grievances. (AP Photo/Kin Cheung)
A police officer points a can of pepper spray in Hong Kong Monday, Nov. 11, 2019. Police in Hong Kong were filmed shooting at least one protester and possibly a second on Monday as demonstrators blocked subway lines and roads during the morning commute. (AP Photo/Kin Cheung)