A law enforcement official says federal investigators have discounted a claim of responsibility for the New York City bombing on the social blogging service Tumblr.

The official says investigators looked into it and don’t consider it relevant to the case. The official was not authorized to discuss an ongoing investigation and spoke to The Associated Press on condition of anonymity

Earlier in the day, another official said that the FBI was aware of the posting and evaluating its authenticity.

The Saturday night blast in Manhattan injured 29 people. Authorities have not yet determined who is behind the blast or a motive. Gov. Andrew Cuomo said it didn’t appear to be linked to international terrorism.

(AP)