Demonstrators congregated outside a mosque chanted ``Down, Mahathir, down'' and sang their battle slogan Reformasi to the tune of When The Saints Come Marching In, while clapping their hands in rhythm.

Witnesses saw some demonstrators kicking a passing police car, which quickly left the scene. Traffic slowed as the demonstrators spilled over from a light rail transit station in front of the mosque.

The protest occurred shortly after Friday prayers. Many of the men taking part wore Islamic skull caps. Anwar, fired by Mahathir Mohamad and subsequently arrested in September last year, was found guilty on four corruption charges and sentenced to six years in jail on Wednesday. Some demonstrators wore tags carrying the name of the National Justice Party (Keadilan) led by Anwar's wife Wan Azizah Wan Ismail.