Rabat – A series of bombings struck five provinces in Thailand, mostly at sites popular with tourists, on Thursday and Friday morning, in what a senior Thai official called a coordinated wave of attacks.Four people were killed and dozens wounded, the police said.Gen. Prawit Wongsuwan, a deputy prime minister in Thailand’s military-run government, said the attacks were “absolutely conducted by the same network.” Another senior official later described the bombings as “local sabotage,” not terrorism. No group has claimed responsibility for the blasts. Two bombs went off at the Hua Hin resort in Prachuap Khiri Khan Province late Thursday evening, killing one woman and wounding 21 other people, the Thai police said. Hours earlier, a bombing near a market in Trang Province killed one person and wounded six.On Friday morning, more explosions struck in Hua Hin, killing another person and wounding three, and at the popular resort island of Phuket, where one person was wounded, the police said. Two bombs also went off in the province of Surat Thani, leaving one person dead, and two near a market in Phang Nga, a southern province, though officials said there were no casualties there.Police officials said several of the bombs were detonated by cellphone.The explosions Thursday night in Hua Hin, which occurred about a half-hour apart, were in an area of bars and nightclubs popular with foreign tourists. At least nine foreigners were wounded in the second explosion, which went off at a crowded intersection, according to Suthipong Klai-udom, a district official.