KUALA LUMPUR, Aug. 13 -- Pandan MP Datuk Seri Rafizi Ramli has claimed that an attack on his 12-year-old son in Putrajaya was a deliberate warning aimed at silencing him, but vowed he will "not bow to any threats" and will continue his duties as usual.

In a statement today, Rafizi said the incident happened at around 1.45pm when his wife and son were getting into their car after leaving a shopping mall in Putrajaya.

"Suddenly, a man grabbed my son and jabbed him with a syringe," he said, adding that checks revealed two men on a motorcycle had been tailing his wife's car.

"In my view, the attack had been planned in advance."

He described the assailants as wearing all black and full-face helmets, saying they had been "lying in wait" and...