Hundreds of residents of two municipalities in Quebec鈥檚 Laurentians region are awaiting further news after being ordered to leave their homes due to structural problems in a nearby dike.

Government inspectors found structural weaknesses in the Morier dike during a recent visit that could lead it to burst.

The evacuation order was issued Sunday night for about 1,000 properties near the Kiamika River in the municipalities of Chute-St-Philippe and Lac-des-Ecorces.

The inspectors suspect internal erosion to be the cause of the structural damage.

Martin Ferland, an engineer at the General Directorate of Dams of the Ministry of the Environment, says experts don鈥檛 know yet when it will be safe for residents to return, noting they鈥檙e still investigating and will try to give people an answer as soon as possible.

The dike on the Kiamika Reservoir was built in 1954 and has the capacity to retain 382 million cubic metres of water, the equivalent of more than 100,000 Olympic-size swimming pools.

The two towns are located about 15 kilometres from each other and roughly 125 kilometres northeast of Ottawa.

Joshua M茅nard-Suarez, a spokesman for the province鈥檚 Public Security Department, said government inspectors found structural weaknesses in the Morier dike during a recent visit.

鈥淭hey suspect internal erosion,鈥� he said in an interview Monday.

Environment Department inspectors 鈥渨ere on the scene to start temporary work,鈥� M茅nard-Suarez said, adding that they will require a minimum of five days, which is how long residents have been told to evacuate their homes.

M茅lanie Lavoie, a geotechnical engineer at the General Directorate of Dams who carried out the last inspection of the dike, said leaks on the downstream side, which included sediments, were observed.

Determining what鈥檚 gone wrong has been challenging, Lavoie said, explaining that it鈥檚 happening inside the dike. She said it could be a design problem, a water overload or many other things.

Lavoie noted, however, that the situation appeared to be stabilized on Monday. Inspections are being carried out every day, and the reservoir level has been lowered.

M茅nard-Suarez said all of the 563 evacuees his department is aware of were able to stay with friends, family or in hotels and did not stay in a shelter set up in the nearby town of Mont-Laurier.

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