Story highlights Londoners "will still see that high level of policing presence; some armed, some unarmed" on MondayTwo arrests have been made in connection with the Friday incident(CNN) London commuters are beginning their working week with heavy security on transport routes following last week's terror attack. An improvised device exploded on a London Underground train as it arrived at Parsons Green station during the Friday morning rush hour, injuring 30 passengers. Two men have been arrested in connection with the incident. JUST WATCHED How Underground terror incident unfolded Replay More Videos ... MUST WATCH How Underground terror incident unfolded 01:36An increased number of police officers could be seen on British streets over the weekend, with police saying there was an emphasis on "crowded places, iconic sites, transport hubs and ports." On Sunday, Home Secretary Amber Rudd said the UK's terror threat level had been downgraded from "critical" back to "severe," meaning an attack is now considered highly likely rather than imminent.

Source: CNN September 18, 2017 05:37 UTC