Police detained a snatch thief who had also attempted to molest a woman.

The man, in his 20s, was an accomplice on a motorcycle and the duo pushed the victim off her motorcycle near Lima Kedai in Gelang Patah at about 5.45am on Sunday.

They then snatched the woman's gold necklace, a mobile phone and RM52($21).

The duo also tried to remove her clothing but she managed to escape and seek help at a nearby toll plaza.

Police detained one of the suspects after raiding a house in Gelang Patah the next day.

Johor deputy police chief Sen Asst Comm I Datuk Jalaluddin Ab Rahman said police were looking for the other man.

"We are looking for one S. Sathis Kumar to assist in investigations. His last known address is in Taman Kota Masai in Pasir Gudang," he told reporters.

He said the detained suspect had been remanded until Monday.