India's capital Delhi is blanketed in toxic smog every autumn, but the pollution is already so bad that it's drawn protests as authorities tell students to stay home.

Delhi has seen bombings before, but Monday’s incident is in a different league. For the first time, the national capital has faced a Suicide Vehicle-Borne Improvised Explosive Device (SVBIED) attack, a tactic security agencies consider one of the hardest to detect and even harder to prevent.

The city's sanitation systems and road conditions require "lot of work", Sirsa said, adding that these gaps are contributing significantly to deteriorating AQI.

India's government confirmed on Wednesday that it was treating a car blast that killed eight people and wounded at least 20 others in Delhi as a "terror incident" and vowed to bring the perpetrators to justice as swiftly as possible.

The move follows a weekend protest where police detained dozens of people demanding cleaner air, a rare public demonstration against pollution in the Indian capital.

Satellite images reviewed by BBC Verify show Israel has destroyed more than 1,500 buildings in areas of Gaza that have remained under its control since the ceasefire with Hamas on 10 October. Click the play button below to watch our data scientist Barbara Metzler explain how we used pixel-wise T-tests to do our analysis.

Those responsible for the explosion “will not be spared,” Prime Minister Narendra Modi of India said. The blast killed at least eight people near a subway station at evening rush hour.

Following a clash with Pakistan earlier this year, Indian Prime Minister Narendra Modi vowed to treat any future attacks on civilians as an “act of war.” That has dramatically raised the stakes for any retaliation to Monday’s deadly explosion in New Delhi.

Three days after a car exploded near the Red Fort in the Indian capital, Delhi, killing eight people, investigators have told the BBC they are checking if it has any links to the recent arrests of seven men by police in Indian-administered Kashmir.

This special report covers the political developments in Karnataka, where Chief Minister Siddaramaiah and Deputy Chief Minister D.K. Shivakumar are in Delhi amid speculation of a cabinet reshuffle. Siddaramaiah met with Congress leader Rahul Gandhi,

The Mobile Crime Team and a Forensic Science Laboratory (FSL) team inspected the spot and collected samples for scientific examination.