Whilst some might find it fair to assume it’s the asian communities in these places that are the cause you could equally make a blind assumption the issue might be that all the Brexit Tommy Robinson loving conspiracy theorists live up north? An equally wild assumption with no evidence...
There's quite a bit of circumstantial evidence to support one over the other though mate.
I know a fair few of those 30 have large Asian populations - I don't recognise any that immediately scream at me that they don't.
The issue for me isn't speculation; it's when it spills over into blame. For me, it could easily be a spike in those populations but for pretty much unavoidable cultural reasons alone. In that instance it'd be like blaming black peope for sickle cell anemia - wouldn't make sense.
There's no evidence really that Asian communities have ignored the rules. So blame shouldn't be apportioned. However, if it is those communities, it's very important that lockdown measures are in place to stop the spread at root, without fear of racism.