New Delhi, Nov. 10 -- Meghan, the Duchess of Sussex, joined Prince Harry at the European Parliament in Brussels on Tuesday for her first public appearance since her estranged father's arrest, attending an event focused on protecting children from online harm.

Prince Harry delivered the keynote address alone after Meghan withdrew from a planned joint speech. He said children deserved to feel safe wherever they were and called for action to prevent harm rather than waiting for tragedy, ITV News reported.

The appearance marked the opening of the Lost Screen Memorial, a travelling installation commemorating children who died after experiencing harm online. Harry did not directly refer to Thomas Markle Sr or the criminal allegations against ...