The Twitter accounts for two CBS programmes in the US have been compromised and suspended.
A CBS News spokeswoman confirmed that tweets were sent from the "60 Minutes" and "48 Hours" Twitter handles saying their accounts were compromised are correct.
The tweets said the network was working with Twitter to investigate.
Both accounts have been suspended and are inaccessible.
Earlier, tweets coming from the 60 Minutes account suggested the US government was "hiding the real culprit of the Boston bombing".
There were also tweets claiming that the "Syrian army fights for all humanity".