Rihanna looks downcast as she heads to the gym as police search for stalker who posted threatening gun tweets and a selfie outside singer's house

By Rachel Mcgrath For Dailymail.com

Published: 19:34 EST, 13 July 2015 | Updated: 12:11 EST, 16 July 2015

Rihanna looked down in the dumps as she tried to maintain her regular routine after an alleged stalker sent her gun threats via social media.

The R&B star, 27, was seen heading for the gym in the SoHo neighborhood of New York on Monday while clutching a $55 ullu-brand 'Cowlick' iPhone 6 Case.

It follows the news that law enforcement continues to search for the man who posted the threatening tweets, including one of a gun and bullets.

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Worried: Rihanna was seen leaving her NYC apartment and heading to the gym on Monday after it emerged police are searching for an alleged stalker

Worried: Rihanna was seen leaving her NYC apartment and heading to the gym on Monday after it emerged police are searching for an alleged stalker

The alleged stalker posted a selfie outside the singer's home on April 30 but by the time police arrived he was gone.

He also sent several menacing messages to and about Rihanna.

TMZ reported Sunday the user account from which the tweets were sent is listed under the names of Alex Mercer and Ralph Alexander and police are now tracking the suspect electronically.

Low key: The Diamonds singer kept her head down as she tried not to draw attention to herself

Low key: The Diamonds singer kept her head down as she tried not to draw attention to herself

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Rihanna was spotted heading to the gym in New York. Probably, to run out her frustration after finding out she has a stalker who tweeted a picture in front of her house!

She downplayed her look and opted for a more modest attire. She wore a black graphic tee that read, "Just a Kid from Saint Michael," along with black tights and black and white training sneakers to match her tee.

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Threatening tweets: Law enforcement are reported to be searching for a man who posted a selfie in front of the R&B star's home and made gun threats
Threatening tweets: Law enforcement are reported to be searching for a man who posted a selfie in front of the R&B star's home and made gun threats

Threatening tweets: Law enforcement are reported to be searching for a man who posted a selfie in front of the R&B star's home and made gun threats

In one tweet, the suspect wrote: 'Should of killed @rihanna a minute back I would be good right now'. 

He went on: 'Sorcery is a weapon I use guns', adding, 'Can’t. Use hands'.

After his Twitter account was suspended, the man appears to be back online apparently with a new alias.

In a message directed at Jay Z, whose label Rihanna is signed to, he wrote: '@S_C_ tell them in not a stalker you know me other page got suspended' (sic). 

Wary: Rihanna kept a tight grip on her cell phone as she walked the city streets

Wary: Rihanna kept a tight grip on her cell phone as she walked the city streets

Dressed down: The 27-year-old was dressed for the gym as she clutched her $55 ullu-brand 'Cowlick' iPhone 6 Case

Dressed down: The 27-year-old was dressed for the gym as she clutched her $55 ullu-brand 'Cowlick' iPhone 6 Case

It's another worry for the star who has had to deal with stalker issues in the past.

Last month a man was reportedly arrested after he was escorted by three police officers and the singer’s bodyguard following an attempt to gain entry to her New York City apartment building. 

And in July 2014, a 53-year-old homeless man was arrested for hand-delivering eerie messages to her apartment in Soho, New York.

Shocking: On April 30, 2015, the alleged stalker posted a selfie claiming to be in front of Rihanna's home

Shocking: On April 30, 2015, the alleged stalker posted a selfie claiming to be in front of Rihanna's home

Menacing: The suspect appeared to also threaten Rihanna's ex boyfriend Chris Brown

Menacing: The suspect appeared to also threaten Rihanna's ex boyfriend Chris Brown

Kevin McGlynn has since been held at a psychiatric hospital for treatment after a judge compared him to the man that shot John Lennon and described the situation as a tragedy waiting to happen.

Back in October 2013, a trespasser was arrested at Rihanna's home in Pacific Palisades. 

The incident came just a week after the same property was targeted by intruders while she was on the Australia leg of her Diamonds World Tour. 

Worrying: Over the last few years Rihanna has dealt with similar situations involving trespassers and stalkers

Worrying: Over the last few years Rihanna has dealt with similar situations involving trespassers and stalkers

Threat? On June 1, 2015 a man was reportedly arrested after he was escorted by three police officers and the singer’s bodyguard following an attempt to gain entry to her New York City apartment building

Threat? On June 1, 2015 a man was reportedly arrested after he was escorted by three police officers and the singer’s bodyguard following an attempt to gain entry to her New York City apartment building

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