<sod >Around 150 attempted journeys to Iraq and Syria were thwarted in 2015. 'We have not got a clue of what is going in and going out.< eod>< sod > Around 150 attempted journeys to Iraq and Syria were thwarted in 2015. Mr Mahmood said the abscence of checks meant security services had to 'work 10 times harder to try and catch up with these people once they have come back'. He said there was too much reliance on biometric passports, with the main focus on monitoring people's immigration status. 'You just walk through,' he said. 'It doesn't check how long you have been out and where you have been to,' he said.< eod>