A driver who survived after her windscreen was smashed by a concrete block dropped from a bridge has spoken of her relief at the miracle escape.
Mother-of-two Lisa Horne, 26, said she believed that "somebody was looking over me" after she and her 48-year-old mother escaped unharmed when their Vauxhall Astra was targeted on a motorway in Essex on Thursday evening.
She said the perpetrator must be caught before someone is killed.
"Obviously if I was going any faster, it may have been a different story. I do feel very lucky," she told a news conference.
Ms Horne said she was "very shaken" by the incident.
"I am scared to drive, I don't think I will be driving in the dark. I certainly won't be going down the A12," she said.
"I am scared that I may never have come home to my children. I have got two young children.
"It has scared me a lot and it has made me realise how precious life is."
Ms Horne's mother Stella told the news conference: "I remember seeing, like, a shadow coming down from the sky, and there was the biggest explosion. That was a rock hitting the car. At the time I thought it was something off an aeroplane, that was the first thought that was in my head."
She said she was "so proud" of her daughter and how she handled the incident.
"I went into mum mode and started shouting," she said.
Asked what she thought of the perpetrator, she said: "I just don't know how they went home that night and slept, when they could have killed four people in half an hour. I can't sleep, thinking about it."