The Kenyan authorities have stopped buses from travelling to the north-east border town of Mandera after movements by Somalia-based al-Shabab militants were spotted on the road to the town.
They were seen between El Wak and Rhama, which are on the road that links the capital, Nairobi to Mandera.
No buses are allowed to leave El Wak meaning that many passengers who were already travelling are now stranded.
Militants have targeted buses in the region before. In 2014, a bus full of teachers was attacked in Mandera County and 28 were killed.