Forensic experts and bomb squad teams inspected the scene at a ATM booth at a Yala municipality minimart after the machine was bombed by suspected insurgents.
ATM booths at various banks including Krung Thai, the Islamic Bank, the Government Savings Bank and UOB were reported bombed concurrently across the provinces.
Initial investigation found that all explosive devices were triggered by using Samsung Hero mobile phones.
CCTVs in Yala's Yaha district caught the images of two suspects, a man and a woman on a motorcycle. Police were seeking to question them whether they were involved with the multiple attacks.
Seven ATM booths in Pattani were bombed including one near the governor's residence.
An army ranger base was attacked by gunmen, with one ranger wounded.
Waena Mudor, a teacher at Ban Jae Kreu Ya School, was shot dead at her home in Sai Buri district while three teacher dormitories were torched.
A firetruck was burned and CCTV cameras at a Kapo district intersection were damaged.
In Songkhla, three ATM booths in Saba Yoi, Na Thawi districts and Sakom subdistrict of Thepa were bombed. Police said the homemade explosives were triggered by clocks.
Five ATM booths in Narathiwat were bombed as well.