AGRA: At least four people were killed and 25 others injured after a collision involving seven buses and three cars on the Yamuna Expressway in the early hours of Tuesday, police said. Preliminary reports suggest that the victims were charred to death after the buses caught fire following the crash. The accident occurred around 4.30 am on the Agra–Noida stretch of the Yamuna Expressway, near Milestone 127, under the jurisdiction of Baldeo police station in Mathura district. Police said heavy fog and low visibility led to the pile-up involving multiple vehicles.Of the injured, all were rushed to nearby hospitals for primary treatment. Police said none of the injured is in critical condition.Speaking about the incident, SSP Mathura Shlok Kumar said the crash was triggered by poor visibility caused by dense fog. “Around 4.30 am, approximately seven buses and three small vehicles collided with each other due to low visibility. The vehicles caught fire after the collision. Local administration and emergency teams reached the spot immediately,” he said.He added that rescue operations are nearly complete. “So far, four deaths have been confirmed. Around 25 people have been admitted to hospital and none of them is serious. They are being provided the best possible treatment. The expressway was completely blocked, so traffic has been diverted from behind. The debris has now been removed and passengers have been sent to their destinations using government vehicles,” the SSP said.SP Mathura Rural Suresh Chandra Rawat said three cars first collided with each other, following which seven buses — including one roadways bus and six sleeper buses — rammed into them. “All the buses caught fire. Eleven fire tenders are at the spot and the fire has now been brought under control. Four dead bodies have been recovered so far. Rescue work is underway,” he said.Rescue and firefighting operations are currently underway. Fire tenders, police teams and ambulances have been deployed, and traffic on the affected stretch has been halted.The fatal crash on the Delhi–Agra Expressway comes a day after dense fog triggered multiple pile-ups across NCR expressways, leaving at least six people dead and several injured. The first major accident occurred near Raniyala Patakpur village in Nuh district, where at least 20 vehicles, including two trucks, were involved in a chain collision on the Delhi–Mumbai Expressway. Two people — CISF inspector Harish Kumar (38) from Alwar and Khalil (45) from Jaipur — were killed, while five others were injured. Another pile-up involving seven to eight vehicles was reported near Banarsi village on the same expressway, though no injuries were recorded. A separate accident on Delhi–Alwar Road near Ghaseda village involved a Haryana Roadways bus and a tractor, causing damage but no casualties. In Faridabad, a Ford Endeavour rammed into a stationary truck near Kail village on the Delhi–Mumbai Expressway, killing two men from Jaipur. A third occupant later succumbed to injuries during treatment. On the other side of NCR, two pile-ups involving around 20 vehicles were reported on the Eastern Peripheral Expressway near Attai village in Noida, leaving a 24-year-old truck driver dead and 13 others injured, police said. Traffic police across NCR said dense fog and near-zero visibility were the common factors in all the crashes and urged motorists to slow down, maintain lane discipline and avoid stopping on expressways during foggy conditions.