BOAT DRIVER Ekkapong Kinglek, 25, will be charged over the deaths and could face up to 10 years in jail, say Krabi police.
Officials at Krabi's Chao Fa Rescue Centre confirmed the deaths of two Indian tourists, a man and a woman, this afternoon.
The couple were returning from a popular coastal holiday spot, Railey, that can only be reached by boat.
The pair were not wearing life vests. The captain of the longtail boat was being questioned by police late today.
With the drowning of a Belgian tourist who fell off a boat while travelling between Koh Tao and Koh Phangan earlier in the day, Sunday's tourist drowning toll for Thailand stood at three.
Officials from the Chao Fa Krabi Rescue Centre were alerted to the tourists being in the water by a call from another boat nearby. It took 40 minutes to reach the scene.
On Ao Nang beach, rescuers tried to revive the tourists using cardiopulmonary resuscitation, but the Indians did not recover.
Their bodies were taken to Krabi Hospital.
A storm with strong winds lashed Krabi, Phang Nga and Phuket today with small boats being warned that it was unsafe to put to sea.
In Thailand, it's left up to individual captains to decide whether to put to sea. Often, if there are paid-for bookings, some captains will venture out regardless of weather forecasts.
The deaths today off Ao Nang come as officials in the tourism industry seek to persuade visitors that Thailand remains safe following the brutal murders of British tourists David Miller, 24, and Hannah Witheridge, 23, on the island of Koh Tao on September 15.
A Belgian tourist fell off a boat and drowned today while travelling between Koh Tao and Koh Pangan. He was not wearing a life vest.
*Phuketwan is joining a one-day seminar on drowning at the invitation of the Wortld Health Organisation in Bangkok on Friday.