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Senior police officials told The Associated Press that a case was registered under the Unlawful Activities (Prevention) Act, India’s main anti-terrorism law, which allows broader powers to investigating agencies to detain suspects. The officials spoke on condition of anonymity because of the sensitivity of the case.

Prime Minister Narendra Modi, who was on a scheduled visit to Bhutan on Tuesday, said investigators would “get to the bottom of this conspiracy.

“The conspirators won’t be spared and all those responsible will be brought to justice,� Modi said.

Police said the explosion was believed to have originated from a Hyundai i20 car that had stopped at a traffic signal. Nearby vehicles were badly damaged, and photos showed shattered windows, twisted metal and flames engulfing several cars.

Police were attempting to trace the car’s owner. There was no immediate information about the occupants, who were believed to have been killed.

No arrests had been made Tuesday but investigators were “probing all possible angles, including a terror attack, an accidental blast or any kind of failure in car," Delhi police spokesman Sanjay Tyagi told the AP.

“Teams are working on leads available so far. Final shape of the investigation will be decided after the forensic team gives a final report on use of any explosives," he said.

Senior police officials said they also were probing possible links to the recovery of arms and material used to make explosives in a separate incident in neighboring Haryana state on Monday.

Police recovered 360 kilograms (793 pounds) of ammonium nitrate, a chemical used to make explosives, and an assault rifle and a pistol in Faridabad city, which borders the Indian capital. The recovery was made before the car explosion.

Home Minister Amit Shah said Monday that “all angles� were being investigated and that security agencies would reach a conclusion soon. He said footage from cameras in the area would play a key role in the investigation.

Major train stations, including in Mumbai and in Uttar Pradesh state, which borders New Delhi, were put on security alert. The security force responsible for guarding key installations in the capital, including New Delhi’s international airport, metro system and major government buildings, said its personnel had also been placed on security alert.

A former imperial palace, the Red Fort is a sprawling Mughal-era complex and a major tourist attraction in the Old Delhi section of the city. Located about 6 kilometers (3.7 miles) from Parliament, the 17th-century monument is a where Indian prime ministers deliver Independence Day speeches on Aug. 15 each year.

The area around Red Fort is typically crowded, serving as a main route to the bustling bazaars of the old city.