The police have not received any ransom demand from the group of men who kidnapped a fish farm manager in Pulau Baik, Lahad Datu in Sabah last Tuesday.

Deputy Inspector-General of Police Datuk Seri Mohd Bakri Mohd Zinin said the motive for the kidnapping was still being investigated.

"There are no new developments, no demand for ransom. And we're still looking into the motive.

"We believe the Chinese national has been taken to the southern Philippines," he told reporters after a Golf Tournament in conjunction with the 207th Police Day here yesterday.

He also dismissed the possibility of the case being linked to the earlier kidnapping at Singgahmata Adventures Reef and Resort in Semporna, Sabah on April 2.

"This is not linked to that case. We haven't identified the groups involved," he said.

Last Tuesday about 2.45am, five armed men kidnapped Yang Zai Lin, 34, who is from Guangzhou, China.

Whereas in Semporna, a Chinese female tourist and a Filipino resort worker were kidnapped by a group of men.

Queried about last Thursday's detention of an East African in Selangor suspected of being linked with the Al-Shabab terrorist group, Mohd Bakri said the case was still being investigated.

"Give us more time to investigate the case thoroughly as it involves certain individuals," he said.

Police are also investigating if the East African was connected to the 11 individuals detained on April 28 for militant activities.