Pol Maj Gen Adul, who is also Metropolitan Police spokesman, was refering to the Network of Students and People for Reform of the Country, a splinter group which has declared independence from the People's Democratic Force to Overthrow Thaksinism (Pefot).
He said intelligence reports to his office said protesters from the group will march to Government House Monday despite the fact that the ISA, imposed in Phra Nakhon, Dusit and Pomprap Sattruphai districts, is still in place until Friday.
Therefore, as a precaution against untoward incidents which might occur, the metropolitan police have closed 14 roads as follows:
- Nakhon Ratchasima road, between Ruenrudee and Pracha Kasem intersections;
- Phitsanulok road, between Wang Daeng and Yommarat intersections;
- Uthong Nai road, from Uthong Nai intersection to the Dusit Palace behind the Royal Plaza;
- Likhit road;
- Rama 5 road, from Orathai bridge to Sukhothai intersection;
- Sukhothai road, between Suan Ruenrudee and Sukhothai intersections;
- Ratchawithi road, between Karn Ruan an Ratchawithi intersections;
- Ratchadamnern Nok road, between Phra Roop and Jor Por Ror intersections;
- Luk Luang road, from the Wisukamnarueman intersection to Thewakam bridge;
- Phichai road, from Khattiyani intersection to Ratchawithi road;
- Si Ayutthaya road, between Wat Benjamabophit and First Division intersections;
- Nakhon Sawan road, from Phitsanulok intersection to Thewakam bridge;
- Nakhon Pathom road; and
- Krung Kasem road, between Prachakasem and Thewakam intersections.
These roads were closed from 2pm on Sunday. Checkpoints have been set up to enforce the ban. People who live along these roads and officials wanting to travel to offices are required show their identification cards.
According to Pol Maj Gen Adul, intelligence reports also said people from other provinces would join Monday's protest.
Meanwhile, Taikorn Pholsuwan, Pefot coordinator, said Pefot planned to call for people across the country to launch a major work stoppage from Monday.
He said it was now time for the people to rise to solve the country's problems.
Mr Taikorn denied Pefot would move from Lumpini Park to join the group of students at the Uruphong intersection.
Pefot would return to Government House to stage a peaceful and unarmed protest against the amnesty and charter amendment bills, but the date had yet to be fixed, he added.
Pol Maj Gen Piya Uthayo, the spokesman of the peace-keeping administration centre, said the ISA would remain in force in the three Bangkok districts until Oct 18.
It was believed the group gathering at the Uruphong intersection had coordinated with the People's Council for Thailand's Reform of the Green Politics group and other groups for a major rally.
"It is believed the rally will be protracted and involve many groups. This will make it difficult to keep the situation under control. However, the authorities will perform their duties to the best of their ability," Pol Maj Gen Piya said.