London ( CNN ) An 18-year-old British man has been arrested on suspicion of preparing to join ISIS in Syria , UK police say . Counterterrorism officers arrested the man at his home in Hodge Hill , in the city of Birmingham , early Monday , West Midlands police said . `` The operation was pre-planned and intelligence led . There was no immediate threat to public safety , '' they said in a statement . The arrest follows that of three teenagers from northwest London on Sunday after they were intercepted by Turkish police in Istanbul . The two 17-year-old boys and a 19-year-old man were arrested `` on suspicion of preparation of terrorist acts , '' the Metropolitan Police said . They have since been released on bail . The investigation started Friday , after police learned the two 17-year-olds were missing and were believed to be traveling to Syria . They were traveling with a 19-year-old , police said . British authorities shared intelligence regarding the 17-year-olds with Turkish officials Friday , and that night , they landed in Istanbul on a flight from Barcelona , Spain , a Turkish official told CNN . The teens were stopped with another person seen as suspicious by Turkish intelligence at the airport 's risk analysis center , which monitors risky flights and runs checks on suspicious passengers trying to enter Turkey . Turkish authorities questioned the teens , the Turkish official said , and the Metropolitan Police said the three returned to London shortly before midnight Saturday and were arrested . Last week , Turkish authorities said they had arrested a person -- working for an undisclosed nation 's intelligence service -- on suspicion of helping three British girls who are thought to have entered Syria to join ISIS . British police say they think the three east London classmates -- Shamima Begum , 15 ; Kadiza Sultana , 16 ; and Amira Abase , 15 -- traveled to Syria after flying from London to Istanbul on February 17 . Metropolitan Police on Monday announced a new media campaign to deter young people from traveling to Syria . Radio and press advertisements highlighting the influence a mother could have on her daughters would be placed in ethnic minority media , police said . The campaign said that it was mothers who often noticed changes in behavior that could signal an intention to travel to Syria , they said . There was increasing concern about the number of women traveling to Syria , Deputy Assistant Commissioner Helen Ball said . `` It is an extremely dangerous place , and the reality of the lifestyle they are greeted with when they arrive is far from that promoted online by terrorist groups , '' she said . `` The option of returning home is often taken away from them , leaving families at home devastated and with very few options to secure a safe return for their loved one , '' Ball said .
Metropolitan Police announce a media campaign to deter young people from traveling to Syria . The Met says it will be using social media, posters, leaflets and posters in the capital London as well as on its website. Police said there was `` no immediate threat to public safety ''