ROBBERS last night grabbed a teenager by the neck, put a cloth soaked in paint thinner over her face and forced two tablets down her throat, knocking her unconscious.

The three-man gang used tape to tie the 19-year-old woman's hands and blindfold her in the attack on the 10th floor staircase of the Wah Tat Industrial Building in Wah Sing Street at about 6.45 pm.

When she recovered consciousness, she found three gold rings and a bracelet valued at $3,000 and her pager had been stolen. Her wallet containing more than $1,000 was intact.