Commentator Keli Goff has told Daybreak that "churches around the US will be ringing bells 26 times to commemorate the lives lost in the US shooting."
She added: "There's also going to be a moment of silence across the internet. A number of news sites will actually go dark at 9.30am."
More top news
Clear and cooler conditions to the south and east with lows into single figures.
Police have arrested three teenagers and a man following the shooting of a three-year-old girl with an air gun.
Police have released new images of the site of the fatal crash near Shoreham Airshow in which at least 11 people died.