Let's assume, for the sake of argument, that ABC's sources, unlike most of the "sources" being quoted by the news media this week, were actually completely correct. "Some unnamed law enforcement officials sent an email about trying to locate the identities of the people in this picture" still doesn't mean "Feds seek these two pictured at Boston Marathon", because the Feds weren't "seeking" them at all. That was the Post jumping the gun and falsifying things (the Feds were actually seeking two entirely different individuals by the time that picture appeared on the internet and the email was purportedly sent).
It's the same as when they turned "the Feds want to question this Saudi student as a witness" into "Investigators have a suspect — a Saudi Arabian national — in the horrific Boston Marathon bombings, The Post has learned."