“This was a criminal act & highly reckless,” Brennan wrote on Twitter Friday afternoon. “It risks lethal retaliation & a new round of regional conflict.”

Iran’s foreign minister said that attack on Fakhrizadeh had “serious indications” that Israel was involved in the assassination but did not provide additional details – though there are expected to be international repercussions…

“Iranian leaders would be wise to wait for the return of responsible American leadership on the global stage & to resist the urge to respond against perceived culprits,” Brennan wrote, urging Iranian officials to address the topic diplomatically once President-elect Joe Biden’s administration takes over the White House.