A man has been arrested and charged after he climbed the Sydney Harbour Bridge on Sunday morning, police say.

Police said they were told about 6.15am that the man was seen climbing an arch of the bridge carrying a banner.

The 33-year-old man was charged after he climbed the top of the Harbour Bridge in protest at Iran. Credit:Nine News

The 33-year-old addressed US President Donald Trump in a video that appears to have been taken on the bridge and was later uploaded to social media.

In the video, the man identifies himself as a member of the "Restart" movement, a group that, according to its website, wishes to "overthrow the regime of Islamic Republic of Iran" and "establish a government based on knowledge and merits" to bring peace to the Middlesolo cyclist who occasionally rides with a friend or two, but a couple of weeks ago I joined a club ride to seek some insights into cycling's pre-dawn bunch ritual.

A big day out: cyclists heading around Port Phillip Bay. Credit:Simon O'Dwyer One aspect I touched on in the feature I wrote about the experience was the sense of community that many find in such groups. Speaking to riders over the years, I've found that for many people dealing with the pressures of work and the responsibilities of family life, a cycling group is a subtle form of therapy – on wheels. One told me how he tended towards depression, and the discipline of getting out of bed to join club rides, and the associated socialising, kept that issue