Thailand’s police chief on Wednesday said the Bangkok bomb suspect was part of a “network” as the hunt intensified for the perpetrator of the country’s worst-ever attack that left 20 people dead. “The wrongdoer could not have been alone. We believe there must be people helping him, Thai people. It’s a network,” Somyot Poompanmoung told reporters, a day after the emergence of CCTV footage of a suspect leaving a backpack at the shrine just before the blast. The Hindu shrine, popular with tourists and Buddhists reopened on Wednesday with a handful of people arriving to place flowers or light incense in front of the slightly damaged statue of the Hindu god Brahma. Most of the victims of Monday’s attack were Thai, but nationals from China, Hong Kong, the UK, Indonesia, Malaysia and Singapore were among the foreigners killed. No one has yet said they carried out the attack. In a separate attack on Tuesday, an explosive device was thrown at a pier in Bangkok. No one was hurt, but the authorities have not ruled out a link between the incidents.