SINGAPORE - A 68-year-old woman was killed in an accident after being hit by a road sign that was said to be dislodged by a runaway bus.

Police said it was alerted to an accident involving a private bus and a pedestrian at the junction of Bukit Panjang Ring Road and Bukit Panjang Road at 9.56am on Friday (Sept 2).

It is understood that Madam Ong Lim was waiting for a taxi on the curb when the bus rolled down the slope and hit a road sign.

The road sign hit Madam Ong on the face, and she was also left with a deep cut on her leg, said her grandson Mr Lim Jia Zheng in a Facebook post.

She was taken to the National University Hospital where she later succumbed to her injuries, police said.

Mr Lim is appealing for witnesses to the accident on Facebook. He said that the impact was serious and his grandmother's leg was cut to the bone.

"The driver claimed that he was not in the bus when the incident happened, he said that he went to toilet," he wrote.