Four people were killed and 13 others injured in a head-on collision between a truck and a pickup in Madhabpur on the Dhaka-Sylhet highway here in the early hours of today. The deceased were identified as Mostakima Akhter, 35, wife of Ismail Mia of Chamakpur village in Baniachong upazila of the district, her brother Hafizur Rahman, 26, Ayesha Akhter,