According to Israeli media, diplomats serving abroad have expressed their concern that their embassies will be the target of Iranian retaliation.
The US in recent days authorized the transfer of bombs and fighter jets to Israel, according to two sources, Reuters reported on Friday.
Support for Bushnell’s actions has spread on social media by many people who are either pro-Iran or who claim to be pro-Palestinian.
The protester was identified as Aaron Bushnell, 25, an Air Force service member. He is reported to have died from his wounds.
The Netherlands added extra security at the Israeli embassy in The Hague on Thursday following a threat.
The national bomb squad is on its way to investigate the object, the spokesperson said.
The circumstances of the incident are under investigation by New Delhi police alongside Israeli security forces.
Several pro-Palestinian demonstrations have been held outside Israeli embassies around the world in recent weeks, including in Tokyo, in protest against Israel.
Four people aged between 17 and 21 found in the area were remanded on suspicion of attempting to destroy property with explosives, possession and use of explosive materials and carrying a weapon.
The US embassy said it is back to normal operations on Wednesday afternoon.