As several agencies piece together what led to the explosion near the Red Fort on Monday evening that killed at least 13 people, several questions remain unanswered. Here’s what is known so far — and what investigators are still probing.

1. When did the blast happen and how did it unfold?

Around 6.30 pm on Monday, the area around the Red Fort and the adjoining Chandni Chowk market was teeming with people when a white Hyundai i20 arrived. Minutes later, the car exploded as it moved toward the main red-light intersection near the monument. Over a dozen vehicles caught fire and body parts were found scattered within a 100-metre radius.

2. How did the car enter Delhi and who owned it?

After scanning over 100 CCTV cameras, Delhi Police found that the Hyundai i20 was first spotted outsid

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