A gunman killed at least four people and himself at an office tower that houses Blackstone Inc., Rudin Management, the National Football League and KPMG among others, sparking hours of chaos and fear in Midtown Manhattan on Monday evening. The suspected gunman's body was found on the 33rd floor, which is occupied by Rudin, and authorities identified the shooter as 27-year-old Shane Tamura from Nevada. Commerce Secretary Howard Lutnick said a 90-day extension of a trade truce with China was a likely outcome with negotiations between the two countries underway in Stockholm. Lutnick’s comments followed the start of a new...