Story highlights Ecuador says a hidden recording device was found inside its London embassy

The "spy microphone" was placed in an electrical outlet, the foreign minister says

He calls for British authorities to assist in Ecuador's investigation

Ecuador is calling for British authorities to help investigate after officials found a secret recording device planted inside the South American country's embassy in London.

A "spy microphone" was found inside the Ecuadorian ambassador's office on June 14, Ecuadorian Foreign Minister Ricardo Patino told reporters Wednesday. It was hidden inside a small white box inside an electrical outlet, partially covered by a bookshelf, he said.

The discovery, Patino said, "very seriously concerns us."

"We are requesting backing from the British government to continue with the investigation of the device found," he said.

The device, he said, contained a SIM card and was designed to transmit private conversations occurring inside the embassy. Ecuadorian authorities believe it had been in place for weeks.

It was found two days before Patino was scheduled to arrive at the embassy, he said.

Patino said authorities have "founded suspicions" that indicate a private British surveillance company was involved, but he did not provide additional details. The company did not immediately respond to a request from CNN to comment.

In addition to serving as an office for Ecuadorian officials abroad, the embassy has also been home for more than a year to WikiLeaks founder Julian Assange, who received asylum from Ecuador in August and risks arrest if he leaves the property.

WikiLeaks founder Julian Assange speaks from the Ecuadorian Embassy

It also comes as Ecuador plays a key role in the global guessing game over the next steps for Edward Snowden , the former NSA contractor who is on the run after admitting that he leaked classified documents about U.S. surveillance programs.

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Patino said on Wednesday that his country was still evaluating the request.

Asked whether Assange's presence inside the Ecuadorian Embassy had opened the building to more risks, Patino acknowledged that the WikiLeaks founder's presence had brought greater attention to the embassy.

"Surely, there are risks, yes ... but we are willing to run them when it comes to defending rights," he said.