6:30pm UPDATE: The line has recently reopened.
ORIGINAL: All lines though Hither Green have been blocked over the past 30 minutes.
The Southeastern line through Sidcup is not operating towards central London and Gravesend.
NEW: Due to emergency services dealing with an incident near #HitherGreen, trains through this area may be delayed, altered or cancelled. More information to follow.
— Southeastern (@Se_Railway) October 27, 2019
Passengers have complained of poor communication with drivers unaware what is happening.
Some stations on the line are also unstaffed today with passengers unable to seek help.