Hamilton's police claim that a man was charged after allegedly threatening the airport and hospital.
Investigators claim that charges relate to online threats to Hamilton's international airport John C. Munro and Hamilton Health Sciences.
They say police searched Hamilton's house on Friday and arrested a 22-year-old local man without an incident.
Police say he is charged with three charges of threatening to threaten to cause death.
It also faces accusations of malicious, unauthorized use of computers and disregard for identity.
The police say that the man was in charge of the hearing.