Officials of US investigating agency FBI on Sunday met Bangladeshi officials and offered their expertise in probing the murder of secular blogger Niladri Chattopadhyay Niloy.Mahbub Alam, a deputy commissioner of police, told reporters here that the Federal Bureau of Investigation (FBI) officials inquired if Bangladesh detectives need any help in their investigation.The FBI officials also discussed the findings in the murder of another liberal blogger Avijit Roy, The Daily Star reported.On Friday, unidentified assailants hacked 28-year-old Niloy to death inside his home here.Niloy, a Gonojagoron Mancha activist, is the fourth blogger to have been killed this year in Bangladesh by suspected Islamist militants.