The Dartford Crossing was blocked creating long delays due to a police incident on the Queen Elizabeth II Bridge.
All traffic was also forced to stop in the Dartford tunnel due to the incident but all lanes have since reopened.
Essex Police told the Standard they were responding to concerns for someone on the Dartford Crossing.
The Queen Elizabeth II Bridge was completely shut for 30 minutes on Wednesday afternoon.There were long tailbacks on the M25 on both sides of the River Thames following the incident.
Earlier on Wednesday some Tube trains were unable to stop on the London Underground at Victoria due to flooding on Wednesday morning.
Eastbound Circle and District Line trains were briefly unable to stop at the busy station.
Londoners are getting drenched on their journeys to work and school on Wednesday morning, as rain lashed the country.
The capital has narrowly escaped a yellow weather warning that is in place for the majority of England, Wales and Scotland on Wednesday and Thursday.
National Rail has warned heavy rain could cause flooding across the British rail network on Wednesday and Thursday.
