The gathering is organised by Parti Amanah Negara and supported by DAP and PKR.
Rally-goers had earlier gathered at Sogo shopping complex around 2pm before heading towards Dataran Merdeka.
READ: Anti-GST rally set to take place this afternoon
Astro Awani's journalists -- TK Letchumy, Mariah Ahmad and Hilal Azmi -- are providing live coverage of the rally, from the location.
5:35pm - Rally ends, protesters duly disperse.
5:27pm - Tun Mahathir ends his speech.
5:20pm - Tun Mahathir starts his speech.
5:15pm - Former prime minister Tun Dr Mahathir Mohamad and his wife Tun Dr Siti Hasmah arrive.
5:00pm - PKR's vice president and secretary-general Rafizi Ramli delivers his speech.
4.20pm - #BantahGST rally takes a short break for Asar prayer.
Pictures from Anti-GST rally
Pictures from Anti-GST rally
Pictures from Anti-GST rally
Opposition Leader Datuk Seri Dr. Wan Azizah Wan Ismail arrived at the #BantahGST rally, in Jalan Raja
3.20pm: PKR's vice president Nurul Izzah Anwar delivers her speech
Among the leaders who were present at #BantahGST
3.10pm - PKR's Batu MP Tian Chua delivers his speech
2.50 pm - Speech by a DAP representative before heading to Dataran Merdeka.
2.30pm - Anti-GST protestors, totalling about 5000 now begin marching towards Dataran Merdeka.
2.20pm - About 2000 people have gathered in front of Sogo for the Anti-GST rally.
2.00pm - The rally goers have gathered in a few locations in the city before starting the march towards Sogo.