Israel deported Swedish climate activist Greta Thunberg on Tuesday, who was aboard the Gaza-bound aid vessel Madleen seized by Israeli naval forces a day earlier.

The incident highlights mounting tensions over Israel’s naval blockade and the worsening humanitarian crisis in Gaza.

The Israeli Foreign Ministry confirmed Thunberg’s deportation via a social media post showing the activist, who is famously opposed to air travel on environmental grounds, sitting on a plane.

She was en route to France before heading home to Sweden.

Thunberg was one of 12 passengers aboard the Madleen, an 18-meter ship launched June 1 from Catania, Italy, by the Freedom Flotilla Coalition.