London ( CNN ) -- British authorities are investigating after various female journalists got bomb threats via Twitter amid escalating calls for action to prevent abuse against women on social media . The bomb threats come only days after feminist Caroline Criado-Perez and Labour Party politician Stella Creasy received a barrage of rape threats via Twitter , prompting a wide outcry . A Metropolitan Police spokesman said Thursday the force had `` received a number of allegations relating to threats sent to a number of female journalists on Twitter and inquiries are being made . '' No arrests have been made , he said . Twitter faces new pressure to limit hate speech . Hadley Freeman , a columnist with The Guardian newspaper , was one of the journalists sent the online bomb threat Wednesday by an anonymous Twitter user . She alerted police after receiving the message , which read : `` A BOMB HAS BEEN PLACED OUTSIDE YOUR HOME . IT WILL GO OFF AT 10:47 . '' `` We 've gone from rape to bomb threats , I see , '' she said . Another tweet by Freeman said , `` Thanks all for your concern . The police have been round and are now investigating this 'arrestable offense . ' `` Freeman had written a column Tuesday titled `` How to use the internet without being a total loser , '' which looked at online misogyny , abuse and freedom of speech issues . Another columnist , Grace Dent who writes for The Independent and others , received the same bomb threat via Twitter . She shared a screen grab of the message , saying `` Well , this is a new low . '' Other women to be sent it include Time magazine 's Europe editor , Catherine Mayer , who described it on Twitter as a `` Not very credible-sounding bomb threat addressed to me . '' Women 's editor Emma Barnett of The Telegraph newspaper said she had also received the threat but , rather than report it , had headed to the pub to meet a contact as planned . Explaining her reaction , she said it was in part due to having had `` years of abuse on Twitter and in the comment box beneath my Telegraph articles , '' and in part a lack of faith in the ability of the police to do anything about it . The account from which the bomb threats were sent has been suspended . Arrests after onslaught of rape threats . Criado-Perez , a freelance journalist as well as a feminist campaigner , attracted the attention of Internet `` trolls '' by petitioning to have women displayed on British banknotes . Police in Manchester arrested a 21-year-old man Sunday . Criado-Perez contacted police after a daylong onslaught in which she received around 50 sexually abusive tweets an hour . The feminist champion , whose campaign resulted in the Bank of England agreeing to picture `` Pride and Prejudice '' author Jane Austen on every 10-pound bill , tweeted throughout the abuse : `` I actually ca n't keep up with the screen-capping & reporting -- rape threats thick and fast now . If anyone wants to report the tweets to Twitter . '' Twitter UK 's General Manager Tony Wang said the social networking company takes online abuse very seriously , offering to suspend accounts , and called on people to report any `` violation of Twitter rules . '' Creasy , who represents Walthamstow in east London in Parliament , became the target of online rape threats after she spoke out in support of Criado-Perez . She tweeted late Sunday : `` You send me a rape threat you morons I will report you to the police & ensure action taken . '' A 25-year-old man was arrested in northeastern England on Tuesday on suspicion of harassment , the Metropolitan Police said , in connection with `` allegations made to police by two separate victims , who made reports of malicious communication to police on 25 and 29 July . '' An online petition set up on Change.org calling for Twitter to add a `` report abuse '' button to tweets has garnered more than 110,000 signatures . `` Abuse on Twitter is common ; sadly too common . And it frequently goes ignored , '' the petition states . The micro blogging site must recognize that its current reporting system `` is below required standards , '' and do more to protect its users , it says . Backlash over rape-threat tweets . Widespread 'women-hating ' Vivienne Hayes , chief executive of the London-based Women 's Resource Centre , a national umbrella group for women 's charities , said the online abuse directed against women is `` extremely concerning . '' `` You have to ask the question , where does this come from ... and why do some people think it 's acceptable to do that ? '' she said . Hayes suggests that the way that women 's worth is commonly assessed in the media by their `` physicalness , sexuality and availability to men '' is sending the wrong message to men and women . The Twitter threats are `` one of the more serious manifestations of what appears an unacceptable level of women-hating , '' she said , adding that it points to a society-wide issue that is fairly deep-rooted . Education is key to changing attitudes and making clear that the denigration of women and violence against them are unacceptable , she said . `` I hope the horrendous level of this kind of trolling is going to push this issue into the forefront '' and prompt government action , she said . CNN 's Alexander Felton , Atika Shubert and Oliver Joy contributed to this report .
A women 's organization says the abuse points to a wider `` women-hating '' culture in UK . The bomb threats come days after two women get a barrage of rape threats . 110,000 people sign an online petition urging Twitter to add `` report abuse '' button to tweets . Twitter says it takes online abuse seriously and encourages people to report it .