"I have resigned and sent the papers to the state government," Singh said today, becoming the first serving Mumbai Police Chief to resign from service.
According to sources, 59-year-old Singh opted for the Voluntary Retirement Scheme yesterday and sent his papers to the state Home Department, which forwarded it to the Chief Minister's Office for acceptance.
"The government has accepted the resignation of Singh with immediate effect today," Home Minister R R Patil told PTI.
Singh, who was due to retire next year, is understood to have been mulling contesting the upcoming Lok Sabha polls either from Mumbai or Uttar Pradesh, his native state.
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According to some reports, he has offers from BJP as well as Aam Aadmi Party.
"So far, my sphere of work was limited to Mumbai, now I want to serve the country. I will work for national unity, social harmony, national integration and world peace," he said.