Istanbul metro incident disrupts M4 line near Bostancı station

Istanbul metro incident caused a temporary disruption on the M4 Kadıköy–Sabiha Gökçen Airport line near Bostancı station on Wednesday evening, with passengers evacuated after a technical malfunction in the tunnel. Authorities confirmed that the train slowed down and no derailment or overturn occurred during the event.

The Istanbul metro incident took place during rush hour on June 18, 2026, when passengers reported a sudden jolt before the train came to a stop underground. Initial reports pointed to a switch malfunction as the likely cause. Emergency teams from Metro Istanbul arrived quickly and began evacuation procedures inside the tunnel.

Three passengers were injured and transferred to hospitals for treatment. Other passengers were guided on foot through the tunnel to a safe exit point. Metro Istanbul suspended service on the affected section while technical crews inspected the track and repaired the faulty switch.

Metro Istanbul later confirmed that operations on the M4 line resumed after safety checks were completed. Officials stated that emergency protocols worked as intended and likely prevented a more serious outcome by slowing the train before the incident escalated. A formal investigation has been launched to determine the exact cause of the switch failure and whether maintenance factors played a role.