What we know:

• Police have released two new photos of “a person of interest” in the killing of US health insurance executive Brian Thompson in New York on Wednesday
• NYPD are continuing their manhunt for a suspect after the “targeted attack” on the UnitedHealthcare CEO in Midtown Manhattan
• Thompson was shot in the back and leg around 06:45 EST (11:45 GMT) on Wednesday morning outside the Hilton hotel
• Investigators say the words ” deny” “defend”  and “depose”  were written on the shell casings recovered at the scene of the attack,  CBS News reports
• Police are using facial recognition technology and a discarded phone to identify and track down the suspect, and are focusing on a surveillance image taken in a branch of Starbucks just before the shooting
• Thompson, head of the largest private insurer in the United States was in New York to speak at an investor conference later on Wednesday