Perhaps “CBS Evening News” should assign a reporter to figure out what happened on its Tuesday broadcast.

A local anchor handed off to Norah O’Donnell as usual — but she never showed up. The network ran ads for several minutes before abruptly cutting to its rolling news feed on CBSN.

A TV insider quipped, “Looks like they had a case of the CBS Evening Blues.” CBS tweeted that it was “experiencing technical difficulties” on the East Coast.