The Delhi police on Saturday arrested an employee of the All India Institute of Medical Sciences in connection with a scam involving selling of medicines illegally.

Rattan Lal, a sweeper, was arrested following interrogation of the five accused arrested earlier, police sources said.

Lal was allegedly acting as a conduit for the selling of medicines and was active in arranging clients. He is the fourth AIIMS employee to be arrested in the case, which came to light about 10 days back.