A 15-year-old cyclist and a pair of bus passengers are in hospital after a crash on the Rapibus transitway Tuesday morning.

It happened around 8:15 a.m. at a crossing near the mini-putt course on Sillery St., parallel to de la Gappe Blvd. According to Sgt. JP LeMay, it's not clear if the boy on the bicycle was walking or pedalling his bike across the transitway. It's also not clear if the pathway is an approved bike route and if the crossing is a formal one, properly marked.

"An investigation is underway," said LeMay.

The bus was headed westbound, from Gatineau to Hull.

The man's injuries aren't expected to be life-threatening, but they are considered serious. Four people on the bus were hurt during the collision, two of them, were taken to hospital, one for a head injury and the other for a leg injury.

The $255-million Rapibus system was reviewed in May after riders complained of delay s and more than a dozen crashes in just eight months. An April rush hour crash sent 17 people to hospital.

More to come.

Twitter: @DougHempstead