An envelope addressed to the Israeli Embassy and containing a note was found at the site of a minor IED blast near the mission in Delhi on Friday, sources said. They said the envelope was addressed to embassy officials but did not divulge any further details including the content of the note.
"The envelope has been recovered from the blast site," a source said.
Investigators scanned footage of CCTV cameras installed nearby and spotted a vehicle moving suspiciously near the embassy just before the explosion, sources said.
A minor IED blast took place near the Israeli Embassy in the heart of Lutyens' Delhi on Friday evening, police said. No one was injured.
Some cars were damaged in the blast in the very high-security zone.
Delhi Police Additional PRO Anil Mittal said initial impressions suggest that it could be a mischievous attempt to create a sensation.
Delhi Police chief S N Shrivastava said that the force has registered a case and its Special Cell has started investigating the matter.
The blast took place when President Ram Nath Kovind, Vice President M Venkaiah Naidu and Prime Minister Narendra Modi were present a few kilometres away at the Beating Retreat ceremony at the culmination of the Republic Day celebrations.