BANGKOK, June 12 -- Thailand's anti-coup activist Sombat Boonngamanong has been formally charged with inciting unrest, violating the Computer Crime Act and defying the order of the military junta, Pol Col Prasopchoke Prommun said Thursday.

Sombat denied all the charges after the military handed him over to the Crime Suppression Division (CSD) of the Royal Thai Police on Thursday morning, said Prasopchoke, deputy commander of the CSD.

Later, Sombat was taken by the police to the Bangkok Military Court, which has yet to decide whether to approve his release on bail, Prasopchoke said.

Sombat was arrested by the National Council for Peace and Order (NCPO) on June 5 after having defied the NCPO's order to report in and allegedly used social networks to spearhead a number of sporadic and small-scaled anti-coup rallies.

The NCPO has banned political gatherings of five people or more since the May 22 coup.

In a related development, deputy Bangkok police chief Pol Maj Gen Amnuay Nimmano on Thursday threatened to arrest those who post anti-coup messages on social networks.

The Bangkok Metropolitan Police Bureau is now collaborating with the Technology Crime Suppression Division to track down people who post messages deemed as instigating anti-coup or anti- junta protests, Amnuay said.

Anyone who shares anti-coup messages will also violate the law and could face arrest, he added.

Earlier, Jakrapob Penkair, a fugitive co-leader of the United Front for Democracy against Dictatorship, or "red shirts," wrote on his Facebook page that an anti-coup organization had been formed overseas, without giving details as to which foreign country had been chosen as the organization's base.

Jakrapob, a former cabinet minister, has taken self-exile overseas over the last several years and is widely known to have been staunchly loyal to former premier Thaksin Shinawatra.