Protesters and members of the aviation industry stage a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

An information counter is seen covered with post-it notes as part of the "Lennon Wall" movement during a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

A demonstrator holds a banner during a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

A demonstrator holds a banner during a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019. Picture taken with a slow shutter speed.

Demonstrators wear post-it notes as part of the "Lennon Wall" movement during a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

A woman writes on a post-it note as part of the "Lennon Wall" movement, during a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

Demonstrators deliver leaflets to tourists at the arrival hall during a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

Demonstrators sit at the arrival hall during a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

Post-it notes reading "Free Hong Kong" as part of the "Lennon Wall" movement are pictured during a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

Demonstrators wear post-it notes as part of the "Lennon Wall" movement during a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

People paste post-it notes on a demonstrator as part of the "Lennon Wall" movement, during a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

Protesters and members of the aviation industry stage a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

A demonstrator wears post-it notes as part of the "Lennon Wall" movement during a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

An information counter is seen covered with post-it notes as part of the "Lennon Wall" movement during a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

Demonstrators paste post-it notes and banners under an information screen during a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

A demonstrator wears a placard during a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

Protesters and members of the aviation industry stage a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

Protesters and members of the aviation industry stage a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

Protesters and members of the aviation industry stage a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

A demonstrator delivers leaflets to tourists at the arrival hall during a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.

Protesters and members of the aviation industry stage a protest against the recent violence in Yuen Long, at Hong Kong airport, China July 26, 2019.