Only four men may have carried out the attack on a Kenyan mall that killed more than 60 civilians in September, and they probably escaped alive, according to an NYPD report made public Tuesday.

The report debunked many of the assertions made by Kenyan authorities, who claimed that as many as 15 attackers were involved, including some who might be foreign nationals, and that they were holding hostages.

[link to investigations.nbcnews.com]