At least 22 people were injured Sunday, October 31 by an apparent suicide bombing in the heart of Turkey's premier city, Istanbul.

The 10:30 a.m. explosion struck Taksim Square, a vast transportation and commercial hub that is the city's busiest node. The apparent targets were police officers at a law enforcement substation at the square's northern end. At least 10 of those injured were police, and two of the wounded face life-threatening injuries.

Istanbul police chief Huseyin Capkin said more bombs were found in the square, according to Turkish media. Authorities barred all pedestrian and vehicular traffic to the square, popular with tourists, in case of more explosions, Los Angeles Times reported.