Social networking site Twitter has clarified its rules on abusive behaviour amid an increasing backlash over so-called "trolls".
The company has updated its rules to make it clear that abuse will not be tolerated, and has put extra staff in place to handle reports of abuse, it said today.
Stella Creasy was targeted after giving public support to a feminist campaigner who had herself received such abuse on Twitter
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Paramedics were on standby outside the police cordon as armed officers stood by the property.
A team of researchers has taken samples from the ten busiest London Underground lines to work out which are the dirtiest.
The action comes on top of an emergency timetable which has seen hundreds of trains a day being axed.