Days after a low-intensity blast took place near the Israeli embassy, Delhi Police have registered an FIR against "unknown" persons, officials said on Saturday.

The FIR was registered on Friday night under Section 3 (punishment for causing an explosion likely to endanger life or property) of the Explosive Substances Act and Section 427 (mischief causing damage to the amount of fifty rupees) of the Indian Penal Code at Tughlak Road police station based on a complaint lodged by a police officer, an official said.