Update from the crash: 71 people were injured, with 36 needing hospitalization. The number has fluctuated throughout the night, so the final number may change. More importantly, it seems that the injuries were not life threatening. The article does mention that some passengers from the tourist bus had to be removed from the windows.
As for how the incident occurred, the double decker ran past a red light at 1st Avenue & East 23rd Street, rear ending MTA Bus 2481 in the process. The Prevost suffered multiple broken windows on the right of the unit (The ones on the left were intact) but otherwise the unit didn't receive heavy damage. The double decker did see significant damage on the front of the unit. For now the driver of the tourist bus will receive a summons.
https://abc7ny.com/bus-crash-manhattan-buses-collide-tour/13470603/?fbclid=IwAR2SBjkkfA5N__y1MpKxSYHAhcL8ZXZ7Q9_0we0ikDhKzKcJMRAy6GE_078
https://www.nbcnewyork.com/news/local/manhattan-double-bus-crash-sends-18-to-hospital-fdny-says/4484072/?fbclid=IwAR28XN4jOgBF_raeQt-gDw1K3PhfTGz4FDbdJ93S5rSniUxe1Mcy5ozanV8