The #illridewithyou hashtag is continuing to trend on Twitter as a show of support for Muslim Australians after the siege at the Lindt cafe in Sydney.

#illridewithyou is trending worldwide on Twitter, rising by hundreds of tweets per minute - within hours it had been used in almost 120,000 tweets.

702 ABC Sydney have had calls from Muslim listeners who say they are too scared to ride on public transport at the moment.

The hashtag appears to have come from a Facebook post from Rachael Jacobs who was riding on a train, and noticed a Muslim woman quietly take off her head covering.

In her post she said: "I ran after her at the train station. I said 'put it back on. I'll walk with u."

Another woman took to Twitter and wrote: "If you reg take the bus b/w Coogee/Martin PL, wear religious attire, &don't feel safe alone: I'll ride withyou. @me for schedule."

The woman, Twitter user @sirtessa, then suggested "maybe start a hashtag? What's in #illridewithyou?"

Last night Ms Jacobs said she had been overwhelmed by the response to her story.

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This morning Ahmad Malas, 31, travelled with his sister Ezhidar, 29, to work on a Sydney train from Lakemba.

Ms Malas said while people's emotions were "up in the air" she was a "bit concerned about any sort of backlash which could happen especially heading towards the city".

The pair said the siege was upsetting and offered prayers for the hostages and their families.

They welcomed the support being offered by the #illridewithyou initiative.

"It's very positive and just makes you feel you are not alone in this and shows you as well the wider community also appreciates what you are going through. So it's very good to feel you are a part of a wider family," Mr Malas said.

The hashtag has been picked up by a number of prominant tweeters as well as throngs of everyday users, making it one of the most prominant topics on Twitter.

Take a look at some of the tweets.

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