Has the MEK Re-Entered Its Military-Terrorist Phase?

Reza Alghurabi, American Herald Tribune, January 05 2020:… Early on December 31, Iranian news sources, as well as some anti-Iran groups, reported an explosion in front of the building of a construction institute affiliated with the IRGC. A few hours later, a spokesperson for the Mujahedin-e Khalq organization (MEK, a.k.a MKO, NCRI, PMOI, etc.) claimed responsibility for the attack in an announcement. Some Iranian sources released footage of the building showing it was intact and denied the bombing. Some others, quoting informed sources, described the incident as merely a biker throwing a lit firecracker near the building. Has the MEK Re-Entered Its Military-Terrorist Phase?