Three bombs were detonated and reports of suspicious packages have kept emergency crews busy.
Even though Winnipeg police have charged a man in connection with bomb incidents Friday and on the weekend, they are still urging law offices to be on alert for any suspicious packages.
Amsel, 49, is charged with two counts of attempted murder and one count of aggravated assault.
Investigators believe he targeted his ex-wife and legal counsel who represented her in the past over a lengthy divorce proceeding dating back to 2004.
Family lawyer Maria Matousis, 38, was seriously injured when a device went off in a River Avenue law office on Friday.
Over the weekend, police were busy blocking off streets and searching homes and businesses in various parts of the city. That continued Monday with a downtown Canada Post building surrounded and the bomb unit brought in.
An X-ray of the packaged revealed it was a DVD and the employees, who had been forced out, were allowed back in.
Acting deputy police chief Danny Smyth Smyth said other packages may have been sent to other law firms or justice officials who have dealt with Amsel.
"At this point we're still investigating this as a very specific crime. I want to reiterate, like I did on Friday, that we don't think this is a blanketed threat to the general public or to the justice system in general," he said.