Police in Nepal have detained 122 Chinese nationals in its biggest crackdown on crime by foreigners entering the country on tourist visa, officials said on Tuesday.

Fugitive billionaire jeweller Nirav Modi was denied bail in a London court on Friday, following his arrest last week by British authorities on charges over his alleged involvement in a $2 billion fraud at India's state-run Punjab National Bank.

A $2bn bank fraud case brought business to a standstill in both houses of India's parliament on Tuesday as opposition lawmakers demanded Prime Minister Narendra Modi speak on the issue.

The Central Bureau of Investigation (CBI) arrested auditor Mohinder Kumar Sharma, widening its probe into the biggest bank fraud in India's history.

Indian officials are on the lookout for Nirav Modi and his family, who police say left India in January prior to the case being filed.

India's second-largest state-run bank said Wednesday it had detected fraud of almost $1.8 billion at one of its branches, sending its shares plunging more than nine percent.

Former England footballer Adam Johnson has been jailed for six years for sexual activity with a child.