- Melati's pregnancy lasted around 105 days
- Zookeepers kept a careful watch on the first-time mother through hidden cameras
- The cub was too young to be sexed or named
- It was born six months after the opening of the new "tiger territory" at London Zoo
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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.