Thailand reported its biggest spike in coronavirus cases in weeks today after a holiday season in which people traveled and gathered in large numbers amid the rapid spread of the omicron variant, AP reports.

Officials recorded 5,775 new cases, prompting the Ministry of Public Health to raise the official warning level to 4 on a scale of 5, permanent secretary Kiatiphume Wongrajit said. The warning level had been at 3 since the end of December.

Under level 4, the ministry recommends closing high-risk venues, including those with poor ventilation, increasing restrictions on interprovincial travel, limiting group sizes in public places and lengthening quarantine requirements for travelers entering Thailand.