“Don’t touch, check with other passengers, inform station staff or call 999”.
This is the suggestion, made by London Underground staff of what to do, or rather not do, if you see a suspect package.
Of course the problem is that they mean something different from what they have written. The easiest way to get a sense of it is to read the phrase out loud.
Some people still argue that the phrase is correct. But it isn’t. The sentence is simply an extended version of this “Don’t do this or that”.
Perhaps the best alternative would be this. “Don’t touch. Check with other passengers, inform station staff or call 999”.