Malaysian authorities have detained 155 Uighurs, more than half of them children, who were found crammed into two apartments in Kuala Lumpur, immigration officials said.

The Uighurs, a Muslim people from China's far-western region of Xinjiang, were discovered when officers from Malaysia's Immigration Department raided the residential units on Wednesday after receiving a tip-off.

Ninety people, including 44 children, were crammed into one unit, while the remaining 65 were in a second unit, according to a report from enforcement operations unit chief Basri Hassan.