The two were called to Lilongwe Police to file statements and have spent a night in the cooler.
The two are alleged to have received money from the UN body to organise workshops and submitted fake receipts.
The arrests come after HRDC organised violent demos in major cities of the country, with Trapence and another rights activist Timothy Mtambo.
Opposition MCP and UTM joined the demos which turned out ugly with reported lootings, beatings of people and police officers, and destruction of private and public
property.