Another Bangladeshi national died on Monday night taking the death toll to four from a gas cylinder explosion in Zawiya city of Libya.Dulal, who was critically injured, died at a Tripoli hospital, Ashraful Islam, counsellor (labour) at the Bangladesh Embassy, said on Tuesday.Earlier, three people were killed in the incident on Thursday.They were Hanif and Belal from Barguna and Mostafa from Pirojpur.Another person, Chunnu from Barguna, who sustained injuries in the incident, is undergoing treatment, reports United News of Bangladesh.Bangladesh embassy in Libya was waiting for permission to send the victims’ bodies home.