Police have arrested Mohd Ali Baharom, better known as Ali Tinju, following last week's demonstration urging a boycott of traders at Kuala Lumpur's Kota Raya shopping vomplex.

He was arrested at the Dang Wangi district police headquarters at about 7pm, Dang Wangi district deputy police chief SuperintendentHabibi Majinji told the New Straits Times .

Habibi said a police report was lodged against Ali who led the protest at the mall last Friday during which he had urged the boycott to 'teach the traders there a lesson'.

A brawl broke out at the mall yesterday purportedly between dissatisfied customers and traders raising fears of a repeat of the Low Yat Plaza race riot incident in July.

Ali denies involvement in the brawl.

Ali led the protest after a customer claimed he was locked up by a trader for four hours after he refused to buy several mobile telephones.

The customer claimed the trader insisted he pay RM10,000 for four mobile phones even though he was originally quoted a price of RM800 in total.

He said he was released after he paid RM5,000.

The consumers tribunal sided with the customer and ordered the trader to return the money to the customer.

The customer also returned the four mobile phones to the trader.