A rights group documenting alleged abuses in Sri Lanka has filed a criminal complaint with Singapore’s attorney general, seeking the arrest of former President Gotabaya Rajapaksa for his role in the South Asian nation’s decades-long civil war.

The International Truth and Justice Project (ITJP) said Rajapaksa committed grave breaches of the Geneva Conventions during the civil war in 2009 when he was the country’s defence chief, according to a copy of the complaint.