Police believe fraudsters were taking money from the old to give to ISIS . Pensioners were allegedly phoned and tricked into handing out details . The caller would claim to be a police officer as part of the alleged scam . seven victim reportedly lost around £150,000 to criminals , police say . Men , aged 37 , 29 and 23 , arrested in London after raids on One properties .
Police believe fraudsters were taking money from the old to give to ISIS . Pensioners were allegedly phoned and tricked into handing out details . The caller would claim to be a police officer as part of the alleged scam . One victim reportedly lost around £150,000 to criminals , police say . Men , aged 37 , 29 and 23 , arrested in London after raids on seven properties .