After word that terrorist sleeper cells may have been activated with orders to attack Law Enforcement. Police have been ordered to stay alert with their weapons ready. They have been told to stay off social media. In addition to average citizens the unity march is attracting an impressive list of World Leaders. Lets go to paris now where preparations are well underway. Isa suarez has the latest from the french capital. Reporter good morning. On my way in it was still dark this morning. You could see a lot of police on the streets and the barricades stacked and ready to go. There were some million plus people expected to take to the streets today in a show of unity and defiance. The message is that unity is the biggest weapon against the terrorism we have seen here this week. As you said natalie, as we have been saying theres going to be a lot of security. Public transport will be free for those who want to come to the center of paris and protest and to really show make their mark on th