It's festive season. This time of year Kenyan beaches are always busy; but not this year.Here in Mombasa, there are just a few beachgoers as thousands of regular visitors have avoided the coastal city.Abdallah Omar sells bathing suits and he said business was down due to fears over security.For all the years I have been here, this year business has been bad.If I compare it with the last six years business was fairly good. This year I don't think kids will go to school.Mombasa has witnessed a wave of violent attacks and killings of suspected terror suspects and clerics.In the past year, police have stormed Musa mosque in the rundown neighborhood of Majengo twice-temporarily closing down the mosque and three others.Authorities have accused the leaders of some Mombasa mosques of radicalizing young men or recruiting for the Somali terrorist group al-Shabab-which has repeatedly attacked Kenya in the past several years.Police here said there has been an uptick in attacks on civilians, government workers and moderate clerics by these radicalized young men.The security situation has prompted Western countries to issue travel advisories to its citizens.Tourism officials estimate at least 4 million in revenue has been lost so far.