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Traffic was brought to a standstill after police closed a busy west London bridge for more than four hours today.
Witnesses described "chaotic" scenes on Hammersmith Bridge after police cordoned off the area.
Photos from the scene showed queuing traffic after officers closed the bridge, to both vehicles and pedestrians, in both directions.
A Metropolitan Police spokeswoman confirmed officers were called to the scene at 11.45am.
The bridge was reopened around 5pm.
Incident: Police cars near to the bridge, which as been closed off.Nick GubbinsPassers-by and those caught in traffic branded the area "a nightmare".
Closed: Traffic is queuing because of the police incident.Nick Gubbins.Alexander Thygesen said: "Never seen Hammersmith bridge this empty" while Noel Goodey said on Twitter he has been stuck in Hammersmith "for an hour".
Very long delays were reported as traffic queued northbound through Barnes and southbound from Hammersmith Gyratory.