The emergency services rushed to the scene of the incident around 6.45pm on Old Worthing Road, East Preston.
Sussex Police said its officers were called out after a ‘tree fell and hit a bus’.
"No injuries were reported,” a spokesperson for the force confirmed.
"The road was blocked temporarily while highways crews worked to remove the tree.”
Storm Ciarán caused chaos and destruction in some areas of Sussex – with a tree falling on at least one house and others having near misses.
West Sussex fire crews worked to safely remove a tree from the roof of a house in The Causeway, Pagham on Thursday morning.
Meanwhile, homeowners in Littlehampton had a lucky escape when a large tree fell outside brushing the side of the property after landing on a fence.
Follow the latest travel news and school closure updates at sussexexpress.co.uk/news.
. Storm Ciarán hits Sussex
A tree fell on top of a moving bus in Old Worthing Road, East Preston, during Storm Ciarán. Photo: Eddie Mitchell
1. Storm Ciarán hits Sussex
A tree fell on top of a moving bus in Old Worthing Road, East Preston, during Storm Ciarán. Photo: Eddie Mitchell
2. Storm Ciarán hits Sussex
A tree fell on top of a moving bus in Old Worthing Road, East Preston, during Storm Ciarán. Photo: Eddie Mitchell
3. Storm Ciarán hits Sussex
A tree fell on top of a moving bus in Old Worthing Road, East Preston, during Storm Ciarán. Photo: Eddie Mitchell
4. Storm Ciarán hits Sussex
A tree fell on top of a moving bus in Old Worthing Road, East Preston, during Storm Ciarán. Photo: Eddie Mitchell