After three riot police, including one wearing a first aid badge on helmet, were heckled out of Salisbury Garden, a platoon of police emerged from cultural centre, and announced this is an unlawful assembly.
Three types of police identifications in today's Salisbury Garden, from left to right, a printed paper with code of unit and number, a flipped warrant card, a printed paper with butchered code, stating only PTU. 
Part of the brawls in Salisbury Garden earlier this afternoon that triggered the first shot of tear gas today.
Part of an exchange of hurling objects from protesters and firing from police on Salisbury Road after the garden mayhem.
Out of TST, protesters walked to Hung Hom along east Kowloon waterfront. Now they gather outside Hung Hom Pier and discuss what to do.
"Tear gas already?"
A tin plate is turned into a makeshift shield by a #HongKongProtests frontliner. "Maybe it can handle a live round?" he said. It cannot.
Ma Tau Wai Rd north bound lane is cut off by protesters and police chopper finally located this group. From TST to Hung Hom Pier to To Kwa Wan, the black clad group has stretched thin from about 100 to 30. They are still marching, pending purpose and destination.
Soon after the police chopper appeared, riot police touched ground in To Kwa Wan. The brief cat-and-mouse run was won by protesters.
Dozens of riot police unloaded in To Kwa Wan from both police cruisers and plain look white vans.
In To Kwa Wan, I ran into 3 residents who cared about the protesters and 3 who loathed them. The 3 supporters asked If the youth managed to leave and looked relieved as I told them I saw no one arrested. 2 of the other 3 told police where protesters went and 1 called them trouble
#NOW riot police on Nathan Rd / Waterloo Rd. Blue flag brandished. Urged people to leave.
A private vehicle and its driver were stopped and searched on Nathan Road. Journos were demanded by police to stay on pedestrian and police van advanced to block cameras.
How riot police pushed a man back to pedestrian with his shield and shouted at him, leading both sides into quarrel.
#NOW protesters trying to occupy the crossing of Nathan Rd and Argyle St
Journo in grey shirt Ronson Chan of @StandNewsHK was hit by a rubber bullet or foam grenade shot by police in retreat on Argyle St. This is before it happened. Guns were pointed in close range.
Furious protesters are banging Mong Kok station exit C1 and trying to ripped the tin warp after riot police emerged from the exit and threw out a tear gas grenade.
Eventually protesters ripped open Mong Kok station exit C1 and threw one petrol bomb inside. More bricks and bottles followed, along with loud shout of profanity. Some men heard shouting back "Ten years in jail awaits you". No police emerged.
Mong Kok station exit C1 set on fire.
After a few rounds of tear gas, police vans disappeared into side streets to the east. Crowd on Argyle St now.
Riot police fired tear gas on a side street of Nathan Road, catching many gearless passengers off guard.
Tear gas vs petrol bomb on Nathan Rd outside Grand Plaza before orange flag was raised. Protesters retreated a bit to Prince Edward.
"Social worker so what!" a police officer shouted at a woman standing on pedestrian road and asking a young man pinned down by police on Nathan Road his name.
The old man who often seen in protests carrying his calligraphy work was stopped and searched on Nathan Rd. The officer asked him to watch the search closely, "So you won't say I plant something in afterwards."
Reunion of riot police from 3 directions at the crossing of Argyle St and Sai Yeung Choi St South.
The second journo got hit in police firing tonight in Mong Kok. It was in his right foot and no bleeding. Quite an amount of firing on Argyle St in the past 30mins as crowds jeered at and threw objects to police trying to board their vans and leave.
A man in red and black shirt was bitterly beaten up by protesters on Argyle St. Uncertain what caused it.
Messamo calls himself "the cooking man" as he cook for homeless people while travelling and that's why his equipments are culinary devices. Born in Iran and raised in Canada, Messamo has a heart shape Chinese national flag on his pot-met, because "it's our friend".
Again, rubber bullets and tear gas from police leaving the scene. Yet another reporter seriously affected.
A lift lobby at HSBC on Argyle St became a semi gas chamber in the latest round of tear gas firing. A number of people sheltering inside had to be helped out by first aiders.
A driver of a double decker route 905 was affected by tear gas fired by police on Argyle St as the bus was stuck at the crossing of Nathan Rd and Argyle St. He had to let all passengers alight and receive help from first aiders.
Mong Kok approaching midnight.
Patience worn thin. Non stop volleys of tear gas fired by riot police coming from Yau Ma Tei on Nathan Road. Protesters were defiant.
At least one arrest was made by Raptors jumped out of some private vehicles on Nathan Rd and dashed into a side street. Police shouting at journos and social workers, asking them not to interfere their work.
Earlier on Sunday night on Argyle St - 90 seconds of intense firing, when protesters, onlookers and protesters had to squat and duck as no one could tell where the bullets were flying when the guns puffed.
"I love Hong Kong police" and "Carrie Lam hold on" from a drunken man on Nathan Road on Sunday night. Both the police and the onlookers fell in embarrassing silence.
In full - the 140 seconds vid of the brawl in Salisbury Garden that kicked off ten hours of clashes on Sunday. It unnecessarily represents a complete answer to "what started it" but this is all I have got.
Good night.
Good night.
