The Canadian Broadcasting Corp said unidentified persons had been using so-called International Mobile Subscriber Identity (IMSI) spy devices that record all types of telephone, internet or text messaging conversations.
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"Obviously we are very anxious to determine who lies at the source of this activity," Goodale told reporters, saying the Royal Canadian Mounted Police and Canadian Security Intelligence Service spy agency were both investigating.
No Canadian agency was responsible, he said, adding that RCMP does use IMSI devices.
The CBC said it had detected four locations where the devices were being used, close enough to cover Parliament Hill and the office of Prime Minister Justin Trudeau, as well as the US and Israeli embassies.
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