The 21-year-old, already provisionally suspending after failing tests for the substance earlier this year, tested positive after her victory at the Asian Athletics Championships in Bhubaneswar on July 6.

She also failed a separate test at the National Inter-State Athletics Championships in Guntur.

The Indian, 23rd at Rio 2016, won the Asian Championships with a best mark of 18.28 metres.

Kaur also threw 18.86m at the Asian Grand Prix in Jinhua, the 10th best mark of the year, in April.

It had already been announced that the national record holder failed an in-competition test for banned stimulant dimethylbutylamine after the meeting in China.

The same substance was detected in a later sample submitted during the Federation Cup in Patiala between June 1 and 4.

The two most recent failures will not necessarily mean a longer punishment, though, as they will be considered as part of the same offence.

"Since the recent positive results are a continuation of the same substance, all the cases will be treated as one," an India National Anti-Doping Agency (NADA) source was quoted as saying by The Hindu.

Kaur already faces a ban of up to four-years and being stripped of all her titles accrued this year.

Dimethylbutylamine is listed as a specified stimulant on the World Anti-Doping Agency (WADA) Prohibited List and has been the subject of warnings by anti-doping bodies over its presence in supplements.

United States sprinter Trell Kimmons  received a two-year suspension after failing a test for it last year.

Kaur becomes the latest in a recent spate of Indian athletes being implicated in doping scandals.

Jithin Paul, a 400 metres hurdler who also placed fourth in the 4x400m relay at the 2014 Asian Games in Incheon, was found in possession of syringes and vials of meldonium during a raid earlier this season.

Decathlete JJagtar Singh was withdrawn from the Asian Championship team after he failed a test for meldonium, a drug added to the WADA Prohibited List in January 2016.