Within the past hour, several tweets featuring the #LondonAttack hashtag have shown up on Twitter, including one warning Muslims to leave the area of Covent Gardens:
— I_was_Me_Once (@StayingInUSA) May 11, 2015
After that account was suspended, the user apparently began tweeting under a new account:
Others seem to show an explosive device and weapons:
Over the weekend, there were fake Twitter threats from Islamic State supporters targeting two international flights that were subsequently diverted.
But, as was widely reported, one of the would-be jihadists targeting the Texas “Draw Muhammad” event posted a tweet on his account featuring the #texasattack hashtag just minutes before the two terrorists were killed in a gunfight outside the event. These users are clearly trying to mimic that.
— JΞSŦΞR ✪ ΔCŦUΔL³³°¹ (@th3j35t3r) May 11, 2015
Just to qualify, we cannot vouch for the veracity of these tweets or their threats.
UPDATE: The user who apparently made the initial threat posted a screenshot of this article: