According to this morning story at the London Telegraph, trading was halted a few minutes after the market opened at 0800 London time. The market then reopened at 1215, this afternoon Telegraph story reports.
This is the second major problem with the LSE's new trading system since it was made officially operational on the 14th of February. The previous incident happened on the 15th of February. The Telegraph afternoon's article says that the LSE blamed the problem on a "real time data dissemination issue."
Traders were naturally irritated with this latest gaffe.
This is also the second time this week that LSE executive management was embarrassed by the poor performance of its trading operations. As the Telegraph notes:
"On Tuesday, Borsa Italiana, a unit of LSE, suspended trading for six-and-a-half hours because of a technical glitch a day after a day after the country’s benchmark FTSE MIB Index [see PDF on FTSE MIB Index here] plunged amid concern about unrest in Libya."
The LSE is facing an official probe into the Borsa Italiana outage by Italian regulators. UK regulators may decide to start looking into the cause of today's outage as well.
The LSE apologized, of course, for the disruptions.