India's markets regulator has widened an investigation into alleged market manipulation by U.S. securities trading firm Jane Street to include other indexes and exchanges, a source familiar with the matter said.

India’s regulator has temporarily barred Jane Street from accessing the local securities market, dealing a severe hit to the US firm that allegedly made $4.3 billion in trading gains in the South Asian nation in more than two years.

Sebis probe into Jane Street may expand beyond Nifty options to include trades on other indices and exchanges. While the investigation could take time, it is unlikely to trigger broad market disruption,