Tell us: have you been affected by the British Airways data breach?

British Airways shares fell 3% as investors weighed the impact of the hack on ticket sale. Photograph: Tim Ockenden/PA

British Airways has warned customers that around 380,000 card payments on its website and app were compromised during a 15-day data breach.

Related: British Airways data breach: what to do if you have been affected

The airline said “criminal activity” had exposed the personal and financial details of customers who made bookings on its website or app from just before 11pm on August 21 until 9.45pm on Wednesday. The company’s chief executive, Álex Cruz, has apologised and vowed to compensate customers after the breach.

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