An explosion happened in that vehicle, and due to the explosion, nearby vehicles were also damaged,” Delhi police commissioner Satish Golcha told reporters. Police gathered to secure the blast site after an explosion near the Red Fort in the old quarters of Delhi. The US embassy in Delhi issued a security alert to its citizens, asking them to avoid crowds and areas surrounding the Red Fort, and to stay alert in places frequented by tourists. Officials inspected damaged vehicles after a car explosion near the historic Red Fort. About a dozen people were killed in a briefcase explosion outside the Delhi High Court in 2011 - the last such major incident in the city.