President Donald Trump on Friday blasted the “loser terrorists” behind the train attack in London that injured at least 18 people. “Another attack in London by a loser terrorist,” the US president tweeted.”These are sick and demented people who were in the sights of Scotland Yard. Must be proactive!” He then added: “Loser terrorists must be dealt with in a much tougher manner,” without giving details of what that meant. “The internet is their main recruitment tool which we must cut off & use better!” he added, also giving no details. An explosion on a London Underground train on Friday was caused by an “improvised explosive device,” British police said.