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People walk past the logo of the London Stock Exchange

A fault at the London Stock Exchange prevented blue-chip British companies from trading on Friday for over an hour, the longest such outage in 8 years.

An undescribed technical issue kept FTSE 100 UKX, +0.81%   and FTSE 250 MCX, +0.46%   companies from opening until 9:40 a.m. local time.

The LSE has yet to describe the outage.

That’s the second outage in 14 months for the LSE LSE, +0.42%  , which recently inked a $27 billion pact to buy Refinitiv, a provider of financial data and infrastructure.

The LSE’s other exchanges, including the AIM and Borsa Italiana, were operating as normal.

This being the age of social media, Twitter had a few jokes.