There has been widespread condemnation of a demonstration by Muslim protesters who threatened violence during a march. Shadow home secretary David Davis said some of the messages on the placards amounted to "incitement to murder". The protest on Friday in London over cartoons of the Prophet Muhammad saw slogans such as "7/7 is on its way". The police say they are studying photographs of those who attended and that arrests, if necessary, will be made at the "most appropriate time". Separate protests held on Saturday passed off peacefully. Police said more than 100 complaints had been received about the protests....