Here's the latest:
• The New York Post reports the shooter was 20-year-old Adam Lanza. It was initially reported that it was his brother, 24-year-old Ryan Lanza, and a couple of media outlets broadcast his picture on air before retracting the report.
The confusion may have been caused by the fact that the shooter was carrying his older brother's ID, Reuters' Matthew Keys tweeted around 4 p.m. on Friday.
Patch reports that Ryan Lanza told friends that he thinks his developmentally disabled brother may have committed the crime.