Dhaka: With four secular bloggers being killed by suspected Islamists in Bangladesh in recent months, police here have asked secular writers not to "cross the limit" and write anything which hurts religious beliefs of others.

"Do not cross the limit. Do not hurt anyone's religious belief," Inspector General of Police AKM Shahidul Hoque said as investigators struggled to nab the killers of secular blogger Niloy Chakrabarty Neel who was hacked to death at his flat here on Friday.