Unused to terror strikes of such sophistication and global reach, the Delhi Police was on Tuesday struggling to get leads in the bomb attack on an Israeli diplomat's car near the city's Aurangzeb Road crossing.
Twenty-four hours after the attack, the nature of explosive material used in the sticky bomb remained unknown.
International assistance arrived in the form of a team from Israel’s external intelligence agency Mossad, which is assisting the Delhi Police and the National Investigation Agency (NIA). The US Federal Bureau of Investigation also offered help, though no formal request had been made so far.
The attack took place on Monday, with a motorcycle-borne bomber sticking an explosive to an Israeli embassy car at a traffic signal less than 300 metres from the prime minister's residence and fleeing.
The bomb exploded seconds later, seriously injuring diplomat Talyeshova Koren, her driver Manoj Sharma and two others travelling in another car.
“The bomb, which must not have been bigger than a palmtop computer or a brick, would have exploded three to five seconds after it was stuck on the vehicle,” Delhi Police Commissioner BK Gupta said.
But the investigation has so far only ruled out options, rather than coming up with possible answers. The explosive substance is not RDX. Six owners of red motorcycles were questioned and released.
The Delhi Police Special Cell is investigating a person of Iranian origin staying in the city. Bits of magnetised metal were recovered from the blast site.
The police were still in the process of acquiring CCTV footage from the Israeli and Canadian embassies - both are located near the attack site.
Gupta said the Israeli embassy had been asked to provide footage from the past seven-eight days.
“After it was planted on the vehicle carrying the victim of Israeli-descent, the motorcyclist hit a plastic bollard and moved to the other lane, apparently took a left turn and fled,” he said.
The team of the NIA, Delhi Police and Israeli officials visited the Special Cell's Lodhi Colony office in the morning to inspect the bombed Innova.