Last October, a 14-year-old boy opened fire at the Siam Paragon mall in the area, killing three people.
The shooting came just days before the anniversary of a massacre at a nursery in northern Thailand that left 36 people dead.
Tuesday’s incident as Thailand works to bolster tourist numbers.
Some 28 million people visited Thailand in 2023, up from 11 million the year before, but still well down from the 40 million who came in 2019, the last year before the pandemic.
Travel restrictions during the Covid-19 pandemic hammered the kingdom’s vital tourism sector and arrivals have not bounced back as quickly as officials hoped.
Officials are hoping to hit 35 million visitors in 2024, with a target of $55 billion in revenue.