Police are appealing for information after an object was thrown at a blood biker in Lancaster city centre.
Somebody threw a projectile - believed to be an egg - at the motorcyclist as he was transporting life-saving blood, almost knocking him off his bike as he travelled at speed in wet conditions.
Police said the rider "could have been seriously injured".
The blood biker, a man in his 50s, managed to maintain control of the motorcycle after the incident on China Street on New Year's Day at around 5.30pm.
The offender made off from the scene.

PC Ally Kershaw, of Lancashire Police, said: “The item struck the rider and conditions were dark and wet. Luckily the rider managed to maintain control but this could have been far more serious.
“Not only could the rider have been seriously injured but given his transportation of life-saving blood the consequences could have been far-reaching.
“If you have any information, or saw someone in the area around the time of the offence and can help us, please come forward.”
Anyone with information can call 101 or email forcecontrolroom@lancashire.police.uk quoting log 1223 of January 1.
'Blood bikers' support the NHS by acting as a courier service to transport blood and other emergency items to the point of need, providing a free, voluntary 24-hour service.


Lancaster-Morecambe train services cancelled amid heavy rain warnings
Pair jailed for violent attack on man in Lancaster street
Panjab Warriors interview: "Morecambe FC will never be in danger while we are owners."
Canal charity gets the ‘hump’ as Lancaster Canal bridges suffer more collision damage
Lancaster wills company donates thousands to help local community groups making a difference
Morecambe Bay Curriculum wins top award
Lancaster film director's latest action movie now showing in UK cinemas
Appeal after Jack Russell dog found collapsed in Lancaster
Lancaster food companies announced as finalists in new Taste Lancashire Producer Awards
New student apartments block opens in Lancaster
Former BBC reporter and ex-Heysham shipping chief launch popular maritime podcast
Lancaster children get life-saving advice at 'Crucial Crew' water safety event
Crews tackle house fire in Heysham
Police appeal after 20 motorbike thefts in 30 days in Lancaster and Morecambe area
Truck driver jailed for causing death of six-year-old Lancaster girl
Former Morecambe Football Club co-chairmen break silence after shock resignation from board
Royal Lancaster Infirmary ward closed to visitors due to norovirus outbreak
Morecambe Football Club stalwarts resign from board
Heysham coffee shop couple take over Morecambe craft ale bar
Morecambe seafront cafe reopens

