Police in Istanbul detain multiple people in connection with an attack targeting a police checkpoint outside Yapı Kredi Plaza in the Beşiktaş district. According to reports from Daily Sabah, the number of detained suspects increases as investigations continue. One report says detentions reach 11 in the probe, while another states that police detain 16 suspects related to the same incident. The reports describe the attack as a terrorist incident aimed at the checkpoint and indicate that authorities expand arrests while working through evidence gathered at the scene. Details on the attackers, motives, or the sequence of events are not provided in the excerpts shared. The detentions reflect an ongoing law-enforcement process that may include questioning, evidence review, and further legal steps as authorities assess links between suspects and the attack.