The Mossad has become involved in investigating the bomb blast in New Delhi, Kan News reported Motzoei Shabbos.
The report said the agency was checking the possibility of nationals from other countries.
India Today news channel reported that police were questioning Iranian nationals in connection with the explosion.
Israeli missions have been on alert around the world in the wake of the assassination of Iran’s top nuclear scientist in November of last year. Tehran has blamed Israel and promised revenge.
Israel’s Ambassador to India Ron Malka said that the embassy in New Delhi had been on high alert because of “threats” it had been preparing for, even before the small bomb went off outside the mission.
Malka told the AFP that he was not surprised by Friday’s attack, which caused no injuries but blew the windows out of three cars.
The road outside the embassy remained sealed off Saturday as forensic experts sought clues as to who was responsible for what Israeli officials have said they are treating as likely terrorism.
Indian police have so far only described it as “a mischievous attempt to create a sensation.”
“This could have ended differently in other circumstances, so we were fortunate,” Malka said.
“We are always prepared. Especially these last days, we raised the level of alert due to some threats,” he added. “We are not surprised.”
Indian media reports said investigators had found an envelope with a letter addressed to the Israeli ambassador in the street.
The Indian Express newspaper reported that the letter described the low-intensity explosion as a “trailer” and made references to “Iranian martyrs” Qassem Soleimani and Mohsen Fakhrizadeh. “We can end your life, anytime, anywhere,” the letter read.