A third person has died of coronavirus complications in Vietnam, officials said, a day after it recorded its first-ever death as it struggles with a renewed outbreak after 99 days with no local cases.

According to AP, all three died in a hospital in Da Nang, a hot spot with more than 100 cases in the past week. Thousands of visitors had been in the city for summer vacation and are now being tested in Hanoi and elsewhere.

Twelve additional cases were confirmed, all linked to Da Nang Hospital. The city has tightened security and set up more checkpoints to prevent people from leaving or entering the city, which has been in lockdown since Tuesday.