Delhi was among the first states to go into complete lockdown till March 31. (File)

No new coronavirus case has been reported in Delhi in the past 40 hours, Chief Minister Arvind Kejriwal said today, warning, however, that "we should not be happy".

Delhi has 30 cases of coronavirus or COVID-19, which has infected more than 500 people in India. Nine people have died, including one in Delhi.

"In the last 40 hours, no new patient has been tested positive for COVID-19 in Delhi. Of the 30 patients, some patients have gone home. There are only 23 patients now," Mr Kejriwal said.

"This is good news but we should not be happy as the fight is still on. The numbers might spike anytime. We should remain alert. We have formed a team of doctors and medical experts and they will give me a report on how to deal with the situation if the number rises in the coming days," added the Chief Minister.

This morning, Mr Kejriwal had tweeted: "The biggest challenge now is to not let the situation go out of control. Need your cooperation for this."

Delhi was among the first states to go into complete lockdown till March 31 to check the spread of coronavirus, a highly contagious disease that has claimed over 14,000 lives worldwide.

All shops, commercial establishments, factories, workshops, offices and weekly markets have stopped. Only the supply of essential services is allowed.

Yesterday, Delhi banned movement on roads and introduced "curfew passes" for those who had to travel to supply essential goods.

In response to Prime Minister Narendra Modi's tweet that people were not taking the lockdown seriously, Mr Kejriwal had tweeted last evening: "I completely agree with you, Sir. Today, several people violated the lockdown. This is not acceptable. Due to this, the health of all citizens is at risk. This would be strictly enforced in Delhi."