Three people, including the son of a district mayor, were injured in drive-by shootings Sunday morning in Thailand's southernmost province Narathiwat, a military source told Xinhua.

The source said the shooting occurred at about 11:00 a.m. local time (0300 GMT) in Narathiwat's Rue-So district while the mayor's son was chatting with his friends in front of his residence.

Another two people nearby were also attacked by the same gunmen on motorcycle.

The military based in Thai South tightened security measures Sunday morning after a Narathiwat provincial senator was shot injured by a group of gunmen.

Narathiwat Governor Pracha Terat has earlier said the attacks against the politicians were not related to the country's political turmoil since February this year.

The police also said they believed the incident to be related to the daily killing in the southern unrest.

At least 1,300 people have been killed since unrest broke out in January 2004 in the southern provinces along Thailand's border with Malaysia. The violence was blamed on a complex web of Islamic separatists, local corruption and organized crime.

Source: Xinhua