Montreal, Canada - Toronto police announced two arrests on Thursday in connection with the shooting at the US consulate last month, calling the accused "criminals for hire."

The shooting on July 27 was the second time this year gunfire had been directed at the US diplomatic building in the downtown core of Canada's largest city.

No one was injured in either event, but police described both as "national security" incidents, and the initial shooting on March 10 prompted beefed-up protection for US and Israeli diplomatic buildings in multiple Canadian cities, as war gripped the Middle East.

Toronto police said those arrested included a 19-year-old and a minor, who is 15 years old.

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Both have been charged with 11 offenses, including "an attack on premises of internationally protected persons."

"We believe these offenses were carried out by criminals for hire, recruited and directed through encrypted messaging apps," police chief Myron Demkiw said in a statement.

Two men, who are 18 and 19 years old, were arrested in June as part of the investigation into the shooting in March. Police said the men were recruited to carry out violent acts but did not provide further details.