Visitors will be subject to a ban on all liquids being brought into the gallery from this morning, except for baby formula, expressed milk and prescription medicines.
All doors into the gallery will have walk-through metal detectors where bags and rucksacks will be inspected, and visitors have been urged to bring as few items as possible - including no large bags.
Also banned from the gallery premises are "displayed or wearable paraphernalia deemed as offensive or affiliated to organisations that pose a physical threat to the collection", as well as the distribution of any campaign materials.
"Following recent incidents within the gallery it is now necessary to introduce increased security measures to ensure the safety of all those who visit, National Gallery staff and the nation's collection of paintings," a statement said.
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