CHICAGO (CBS) — Were police families the target of threats from protesters?

Chicago police are looking into an incident in which the wife of a high-ranking police supervisor was called on the phone and told her husband had been shot to death on Monday.

The caller then threatened the woman’s life as well.

Hundreds of protesters who marched throughout the Loop all weekend–and clashed with police on several occasions during the NATO Summit–were also tweeting the badge numbers of police officers on the front lines.

Authorities are also investigating claims by the hacker group Anonymous, who said they took down the City of Chicago’s website on Saturday.

For several hours on Saturday morning, the main portal to was not accessible.