BEIJING -- The Chinese mainland-based Association for Relations Across the Taiwan Straits (ARATS) on Monday sent a letter of condolence to the Taiwan-based Straits Exchange Foundation (SEF) regarding the casualties and property damage from a quake that shook the island on Sunday.

The ARATS expressed its concerns about casualties and damage, and it asked the SEF to convey its "sincere sympathies" to those affected by the quake.

Three people died, 20 others sustained injuries and one person has been reported missing in Taiwan due to an earthquake that shook Nantou County on Sunday afternoon, according to the island's disaster response authorities.

The China Earthquake Networks Center measured the quake at 6.7magnitude.