First Thing: Police search for suspect in Charlie Kirk shooting amid condemnation of ‘targeted’ killing

Killing of the conservative activist in Utah remains an active investigation', say authorities. Plus, how not to lose hope in the fight against ecological disaster

Good morning.

Law enforcement were still searching on Thursday for a suspect in the shooting of the conservative activist Charlie Kirk, hours after the close ally of Donald Trump was killed at a Utah university, triggering bipartisan condemnation.

How did it unfold? Local officials said the shooting was believed to be a targeted attack" by a shooter from the roof of a building.

What's happening in response? Warsaw said Nato allies had made concrete proposals to boost its air defenses, with the UK considering deploying Typhoon jets as part of an enhanced air policing mission to protect Nato's eastern flank.

Why might Russia send drones into Poland? The Guardian's defense and security editor, Dan Sabbagh, dissects this question in his analysis, suggesting that a desire to create fear, assess Nato's air defenses and test the US's commitment to the alliance may all be factors.

Head to our live blog for the latest updates.