An official of the home (interior) ministry said Delhi police began questioning nine journalists and social activists linked to the portal NewsClick.

This is the first time in at least two years that the CDSCO has flagged any DEG and EG contamination in its monthly reports as the country tries to crack down on its drug industry dominated by small players.

All infected cases were males aged between nine to 45 years and were reported within the Kozhikode district of Kerala, reports say.

The raids were part of an investigation by the Enforcement Directorate, India's financial crime agency, into suspected money laundering by NewsClick, reports say.

Ties between the two countries have become seriously strained over Canadian suspicion that Indian government agents were linked to the murder of a Sikh separatist leader and Canadian citizen.

The infants were among 24 deaths recorded that day at the Shankarrao Chavan Government Hospital.

The Financial Times says India has threatened to revoke the diplomatic immunity of those diplomats told to leave who remain after Oct 10.

Pakistani officials have long claimed that India sponsors violent groups in Pakistan – claims India has always denied.

Relations between India and Canada have been tense of late, mostly due to the presence of Sikh separatists in Canada who have kept alive the demand for an independent Sikh state.

They say 'adequate security' was in place.

India has dismissed Canada's allegations as absurd, and ties have become strained with both governments expelling a diplomat in a tit-for-tat move.

Since the violence first erupted on May 3, more than 180 people have been killed and over 50,000 have fled their homes in Manipur.