Microsoft Corp. activist employees and supporters were arrested after returning to the company’s headquarters for a second day to demand that the software maker sever business ties with the Israeli military.

Police arrested 18 people at Microsoft headquarters during a pro-Palestinian protest after demonstrators allegedly vandalized property, resisted arrest, and obstructed officers.

Protesters set up a “Liberated Zone” at Microsoft’s Redmond headquarters, escalating pressure on the company to end contracts with Israel.