A police spokesman said the 66-year-old driver of the minibus passed a breathalyser test. No arrests were made.
Separately, a police constable was injured in the abdomen when a Fire Services Department van hit his motorcycle on Lai Chi Kok Road in Mong Kok at around 9.29am.
The spokesman said the van was changing lanes when it rammed into the back of the motorcycle.
The injured officer was taken to Kwong Wah Hospital in Yau Ma Tei for treatment.
Officers from the Kowloon West traffic unit are following up on the case.
Latest police figures show the number of people killed or seriously injured in traffic accidents across the city dropped by 39.4 per cent to 478 in the first seven months of this year from 790 in the same period in 2023.