Border Force officials stop a man at Sydney Airport and seize material after reviewing content from a WhatsApp chat, according to multiple Australian outlets. The reporting identifies the traveller as William Harrop and says the chat contained material officials considered incriminating.

The articles describe the discovery as a turning point in the case, but they differ in what additional details they emphasize beyond the initial seizure. Across the sources, the central shared point is that the WhatsApp messages are linked to the evidence collected during the airport screening. The outlets frame the incident as an example of how digital communications can become relevant to border enforcement actions.

While the core facts reported are consistent—an airport stop, Border Force involvement, and seizure of incriminating content from WhatsApp—any further specifics about the alleged conduct, the legal process, and the exact wording or scope of the messages are not detailed in the provided excerpts. Readers are directed to the full articles for the full range of allegations and procedural context.