ABC News affiliate, 23ABC News, are reporting that the shooter in Taft high school has been apprehended by police.
The station reported that students called the station from inside the school, whilst they were hiding.
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Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.
The violence began after a counter-protester allegedly doused a female rally organiser with pepper spray.
As temperatures climb through the day, the warmest spots are likely to be across western parts of Northern Ireland and western Scotland.