The security agencies looking into the attacks have found that IP addresses of the computers used to issue the tweets have been "masked" by the alleged terrorists, the sources said.
The sources said Twitter has been asked to provide the location of the computer as soon as possible to check the authenticity and gravity of the threat in the wake of US President's visit starting from January 25.
The agencies believe that the tweet could be the handiwork of one of the three terrorists from Mumbai suburban Kalyan who had gone to Iraq to join the IS. Four boys from the area --Areeb Majeed, Saheem Tanki, Amaan Tandel and Fahad Shaikh--had left their home to join IS operations in Iraq.
One of them, Areeb Majeed, purportedly sustained injuries and retured after which he was taken into custody by the National Investigation Agency.
The sources said the tweet issued on Monday from one of the handles is believed to be of the banned group IS. It had said, "Heard that enemy of Allah, Obama is coming to India soon. And Indian Muslims are good in chemicals, so a chemical car bomb will be a good idea."
During the probe, the agency found that since location of the IP address was "masked", it was difficult to decipher where the alleged IS sympathiser was based in India or abroad.
Several images of one of the youths 'Tanki' were circulated on the internet showing his "suicide mission" in Syria's al-haska which were released on Facebook, Twitter and other platforms on which IS runs its propaganda.
The security agencies in the meanwhile have taken all the measures to ensure unassailable security ring around Obama who will be the first even American President to grace the Republic Day celebration as the Chief Guest.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
)