Herald wrong in Dorchester slay story?

The Herald today reports: POLICE NAB TWO - BREAK IN MASSACRE MYSTERY. Sergeant Detective Thomas Sexton, commander of the Boston PD's Office of Media Relations, uses the department's new blog to say the story is absolutely incorrect:

The "sources" are not credible. THE STORY IS NOT TRUE.

While homicide investigators, working around the clock, try not to be distracted by rumors and speculation, a story of this nature is very damaging. Commanders and detectives must now spend the next several hours contacting the victims' families and other witnesses to set the record straight rather than following important leads in this case. ...

My standard newspaper disclosure.