Belgian authorities detained Egyptian activist Anas Habib and his brother, Tarek Habib, in Brussels during Egyptian President Abdel Fattah el-Sisi’s visit earlier this week, Egyptian media reported.

The reports said the arrests were over allegations that Habib had been surveilling and threatening Sisi during his visit to the EU-Egypt Summit.

The activist drew attention in July when he chained shut the gates of Egypt’s embassy in the Netherlands to protest Cairo’s closure of its border with Gaza amid Israel’s genocide in the besieged territory.

Habib filmed himself attaching a bicycle lock around the gates of the embassy in The Hague, describing the act as a symbol of the Egyptian government’s claim that the crossing with Gaza had been closed by Israel and that it was powerless to reopen it.

He went on to do the same act at the Jordanian embassy in response to the kingdom’s response to Israel’s war.