International Airways Group (LON:IAG) has seen a decrease in its shares today after subsidiary British Airways reports stolen customer data.

IAG is the multinational airline holding company of Aer Lingus, British Airways, Iberia and Vueling. Additionally, the company employs over 63,000 people.

British Airways is currently investigating the theft of customer data from its website and the airline’s mobile app. Customers had their personal and financial details stolen. However, this does not include travel or passport details.

The data breech took place for a total of 15 days between August 21 and September 5. That said, it has now been resolved.

Moreover, authorities have been notified and British Airways is currently communicating recommended advice to affected customers.

British Airways’ Chairman and Chief Executive, Alex Cruz, has commented: “We are deeply sorry for the disruption that this criminal activity has caused. We take the protection of our customers’ data very seriously.”

As a result, at 11:27 BST shares in the International Airlines Group has dropped by 2.94%.