Indian police say the explosion of a car in a busy market and tourist area of the capital Delhi, killing eight, is being investigated as an act of terror.
The explosion near the historic Red Fort on Monday evening killed at least eight people and injured 20, a rare occurrence in recent years in the heavily guarded city of more than 30 million people. Several states and key facilities across the country were placed on high alert.
Deputy police commissioner Raja Banthia said Delhi police had registered a case under the anti-terrorism law as well as the explosives act and other criminal laws.
"Investigation is at a preliminary stage and any comment on it will be too premature," Banthia told reporters.
Near the site of the blast in the city's old quarters, a busy market and tourist area, most shops that shut soon after the explosion were yet to open in the early hours of Tuesday.
Forensic experts were seen scouring the site of the blast, which has been sealed since Monday night and traffic restrictions imposed in the area.
Police said a slow-moving car which stopped at a traffic signal exploded just before 7pm local time. Nearby vehicles were also badly damaged.
The explosion left behind mangled bodies and the wreckage of several cars on a congested street near a metro station in the old quarter of Delhi.

Indian authorities are investigating a deadly car blast in Delhi. Source: AAP / Hindustan Times / Sipa USA
Federal home minister Amit Shah said on Monday "all angles" were being investigated and security agencies would come to a conclusion soon.
Relatives of the victims gathered outside the nearby Lok Nayak hospital to identify the bodies of their loved ones.
"We at least know that my cousin is here, whether he is injured or not or the extent of his injury, we don't know anything," said a distressed relative who did not want to be named.
The Red Fort, known locally as Lal Qila, is a sprawling, 17th-century Mughal-era edifice melding Persian and Indian architectural styles, and is visited by tourists throughout the year.
The prime minister also addresses the nation from the fort's ramparts every year on 15 August, India's independence day.
Prime Minister Narendra Modi flew out to Bhutan on Tuesday morning on a scheduled visit to the Himalayan neighbour.
In April, Modi cut short a visit to Saudi Arabia and returned home after 26 men were killed in an attack on Hindu tourists in the Jammu and Kashmir territory.
India blamed that attack on what it called Islamist "terrorists" backed by Pakistan, a charge denied by Pakistan. The crisis led to the worst military conflict between the nuclear-armed rivals in decades before they agreed to a ceasefire after four days.
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