Police in the US's Houston city are investigating a threat against a Gay Pride parade scheduled for next week.\u00a0The police were aware of a tweet that said, "There will be a massive shooting at the Pride parade in Houston, Texas," Houston police spokesman John Cannon said on Wednesday. "We're trying to figure out who it is," Cannon said, referring to the now deleted account "crehgdu123" that tweeted the threatening message. Also Read:\u00a0In wake of Orlando shooting, Joe Biden decries lack of progress on 'rational gun safety' laws "We're looking into it just like we'd look into any other threat made to someone's life." The police encouraged those who have any information about the owner of the account and any possible threat to the upcoming event to inform police immediately. Houston police said that more officers would attend this year's Pride event in the wake of the Orlando gay nightclub shooting, in Florida, which left 49 people dead and more than 50 others injured on June 12. On Wednesday night, Houston Mayor Sylvester Turner, along with more than 1,000 people, attended a candlelight vigil outside the City Hall, honouring the victims of the massacre.