About 20 people were injured after an explosion at a hospital in central Bangkok Monday morning, the English-language online arm of Thai Khaosod reports.
Speaking with local reporters, Thailand’s deputy police chief Srivara Ransibrahmanakul said, “It’s confirmed to be a bomb,” adding that traces of batteries and electric wiring had been found at the scene.
The blast reportedly occurred at 11 a.m. local time in a reception room at the Royal Thai Army-affiliated Phramongkutklao Hospital, also known as King Mongkut Hospital. Police said the blast radius at the army-run hospital, which also treats civilians, was up to 9 feet.
Army chief Gen. Chalermchai Sittisart said the explosion appeared to use materials similar to those found in two earlier blasts in recent weeks, AP reports. “All of this was conducted with the goal of creating disorder to the administrative work of the government and NCPO [National Council for Peace and Order],” he said, referring to the official name of the ruling junta.
Hospital official Lt. Gen. Saroj Kiewkajee told AP that the blast wounded 21 people, and 13 were discharged soon after the explosion.
The attack coincides with the third anniversary of Thailand’s most recent coup d’etat, which put the current military junta in power. At least six explosions have occurred in Thailand’s capital since the 2014 coup.
More Must-Reads from TIME
- How Donald Trump Won
- The Best Inventions of 2024
- Why Sleep Is the Key to Living Longer
- Robert Zemeckis Just Wants to Move You
- How to Break 8 Toxic Communication Habits
- Nicola Coughlan Bet on Herself—And Won
- Why Vinegar Is So Good for You
- Meet TIME's Newest Class of Next Generation Leaders
Write to Joseph Hincks at joseph.hincks@time.com