ULAN BATOR, Jan. 13  -- Two Chinese businessmen were murdered here Sunday in a robbery and all the four suspects have been arrested, Mongolian police and the Chinese embassy said Tuesday.

The four suspects robbed and killed the two Chinese men, who came to Mongolia to purchase wool and cashmere, after breaking into their apartment, police said, putting the motive at greed for money.

Initial police investigation revealed that 210 million tugrug (about 108,864 U.S. dollars) of cash was looted from the apartment.

The four suspects, all in their 20s, left Ulan Bator after committing the murder and robbery and were captured in Darkhan-Uul city in north central Mongolia, according to the police.

The Chinese embassy in Mongolia has urged the Mongolian authorities to fully investigate the case and punish the perpetrators.

Besides, the embassy has also requested Mongolia to beef up protective measures for Chinese enterprises and dwellers in Mongolia, and reminded Chinese nationals to be careful and vigilant.