The Co-op Group, one of Britain’s oldest and most well-known retailers, says a cyberattack earlier this year has dealt a heavy financial blow.

The 181-year-old member-owned business revealed on Thursday that the attack, which hit in April, wiped £80 million ($108 million) off its operating profit for the first half of the year. The disruption forced the company into the red, with an underlying pre-tax loss of £75 million, compared to a £3 million profit in the same period last year.

The incident also cost the Co-op about £206 million in lost revenue between January and July 5. The group, which runs supermarkets as well as funeral care, legal, and insurance services, said it was forced to shut down several systems to contain the attack. That decision limited the damage but caused major operational problems.

The cyberattack came just weeks after rival Marks & Spencer suffered a similar blow, raising concerns about the vulnerability of Britain’s retail sector.

Despite the hit, the Co-op said it expects the impact of the attack to ease in the second half of the year. Photo by Michael Trolove, Wikimedia commons.