These are the headlines you Need2Know:
* **Toronto Shooter Had Tumultuous Mental History:**
The parents of slain shooter Faisal Hussain went public on his history of mental illness, but officials have not yet identified his motives. The 29-year-old shot and killed two and wounded at least a dozen on Sunday. Read the details [here](https://www.cnn.com/2018/07/24/americas/toronto-shooting-investigation/index.html).
* **Umbrellas Up, Northeasterners!:**
A flash-flood warning is in effect after heavy rainfall has flooded several Pennsylvanian towns. In Scranton, certain parts of Hershey park are submerged in water. See the map [here](https://twitter.com/NWS/status/1021536276095426560).
* **Twitter War Forges Ahead:**
Following President Trump’s all-caps [Twitter](https://twitter.com/realDonaldTrump/status/1021234525626609666) threat to Iranian President Hassan Rouhani, the Iranian Foreign Minister Mohammad Javad Zarif fired back on Monday, warning the U.S. to, “BE CAUTIOUS!” Read the full subtweet from Zarif [here](https://twitter.com/JZarif/status/1021471196242735104).
* **North Korea Tunes it Down:**
Just over a month after Trump met with North Korean leader Kim Jong-un in Singapore to discuss denuclearization, the country is dismantling several ballistic missile launch sites. Stay with the story [here](https://www.theguardian.com/world/2018/jul/24/north-korea-satellite-images-show-dismantling-of-missile-test-facilities-report).
Cheddar's Hena Doba with the latest.
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Students, lawmakers and religious leaders have joined forces at a temple in Philadelphia to strongly denounce antisemitism on college campuses and in their communities, one day after University of Pennsylvania President Liz Magill resigned amid criticism over her testimony at a congressional hearing.
The former New York City mayor has already been found liable in the defamation lawsuit brought by Ruby Freeman and her daughter, Wandrea “Shaye” Moss, who endured threats and harassment after they became the target of a conspiracy theory spread by Trump and his allies.
Donald Trump says he's decided against testifying for a second time at his New York civil fraud trial. In a social media post Sunday, the former president said he “very successfully & conclusively” testified last month and saw no need to appear again.
The president of Harvard University has apologized for her remarks at a congressional hearing on antisemitism, saying she got caught up in a heated exchange and failed to properly denounce threats of violence against Jewish students.
The House Education and Workforce Committee opened an investigation into MIT, the University of Pennsylvania and Harvard University after an anti-Semitism hearing on Tuesday.
The son of North Dakota Sen. Kevin Cramer was charged with manslaughter and fleeing an officer after a police pursuit ended in a crash that killed the sheriff's deputy.
