The city of Gatineau said Tuesday it is gradually reopening play structures at its parks after closing them Friday because of fears of wasp infestations.

The city shut down the play structure areas after wasp nests were discovered in sandboxes and in the ground around local swing sets.

City crews said they would rake and sieve the sand at the 21 parks in an effort to get rid of the insects.

City officials said the wasps are not aggressive and the chances of being stung are slim.