"Around 20 vehicles collided one after another at 24 km point on the Expressway leading to Agra," a police officer said.
"Due to dense fog, a UP Roadways bus from Noida to Agra collided with a truck. Thereafter, a number of vehicles collided in a series," the officer said.
He said the injured were taken to Kailash Hospital by Expressway ambulances.
While the girl identified as Suhana succumbed, six injured were undergoing treatment, of whom the condition of three was stated to be critical. The other injured were discharged from hospital.
"Bhim Singh, Pohop Singh and Pawan Singh were admitted to ICU as their condition was critical," a doctor at the hospital said.
Several injured have suffered multiple fractures, he said.
The police officer said "though I was appealing to the drivers to drive slow due to fog, they continued driving fast."
"I had stopped and warned a few drivers but it is not possible to warn each and every speeding vehicle.
People should know that driving in speed in fog is fatal," he said.