Orange Order marches through northern Belfast have thus far gone by peacefully, UTV's Marc Mallet reports.
Orangemen and women have been urged to post "selfies" on the biggest day of the Protestant marching calendar.
Large crowd if supporters singing the sash and cheering the Ligoniel Band as it passes Twaddell protest camp http://t.co/4PF1lL2fMt
Orange March past Ardoyne shop fronts has passed peacefully. Roads now reopened
More top news
The Metropolitan Police Federation, which set up the official JustGiving site, said it felt a "suitable amount" had been collected.
There is no evidence the Westminster attacker Khalid Masood was associated with so-called Islamic State or al Qaeda, the Met Police said.
Janet Ajao said in a statement: "I do not condone his actions nor support the beliefs he held that led to him committing this atrocity."