Every American town that is visited by the evil of a mass shooting goes into a state of shock. But what happened in Dallas - unlike Orlando, Aurora, Newtown and all the others - represents a first for a country blighted by violence.
The mayor of Rio has dismissed calls for the Olympics to be cancelled or postponed because of the spread of the Zika virus. A leading Canadian public health professor last week said it would irresponsible to go ahead with the games with the virus so prevalent in Brazil.
Brazil's president Dilma Rousseff faces being forced from office today as a growing corruption scandal continues to batter the country. The nation's first female president is accused of lying to voters about the level of national debt during her re-election campaign.
Donald Trump could take another decisive step towards the Republican nomination for president in the next 24 hours. His chief rival Ted Cruz has staked everything on winning Tuesday's primary in the mid-western evangelical heartland of Indiana. But polls show he might come up short against Mr Trump again - and even big supporters say that might doom his campaign.
Stars of the hit fantasy drama Game of Thrones have promised fans to expect the best season yet. The sixth series of the blockbuster show will begin on Sky Atlantic on 25 April. The cast appeared at a glitzy premiere event in Hollywood to launch the latest instalments of what has become one of the most talked about shows on television.
Uber has agreed a multimillion dollar settlement with the cities of Los Angeles and San Francisco over allegations it misled customers about background checks on its drivers. The ride-hailing app was accused of carrying out checks that were inferior to those faced by regular taxi drivers in the California cities.
Officials in Hollywood have denied rumours they are planning to remove Donald Trump's star from the Hollywood Walk of Fame. Mr Trump's star has been repeatedly targeted by vandals since his rise to prominence in the race for the Republican presidential nomination.
Police in Los Angeles are trying a radical new approach to tackle the epidemic of child prostitution. Vice officers in America's second largest city say treating teenagers as victims rather than criminals gives them the best chance of rebuilding their lives away from the streets.
A man has been charged with child abuse for leaving his nine-month-old daughter in his car while he made an afternoon visit to a strip club in Los Angeles. Auwin Dargin, 24, is alleged to have left the baby for around an hour while he visited Synn Gentleman's Club in Panorama City earlier this month.
Police in Seattle are continuing their efforts to coax a man from the top of an 80-foot conifer tree in the city's centre. Officers were alerted to the drama on Tuesday morning but when they arrived on the scene the man refused to speak to them.
Muck Rack makes it simple to find people, tweets, or articles that mention any name, keyword, company, hashtag etc. We've compiled this guide to help you make the most of your search.
Selecting a term
Start searching tweets, articles from media outlets, articles mentioned in tweets, journalists'
names, titles and bios with some suggested searches:
Companies or Topics (e.g. iPhone, Microsoft)
Phrases (e.g. "cloud computing") — use quotes to keep the terms together
Twitter handles (e.g. @username) — returns those who have mentioned or replied to
Names (e.g. David Pogue)
Hashtags (e.g. #sxsw, #london2012)
Bio details (e.g. vegan, Olympics, father)
Muck Rack's Advanced Search allows for many boolean operators.
Find results that mention multiple specified terms, use AND or
+. For example, ensure each result contains both politicians Barack Obama and Mitt Romney by
searching Obama AND Romney or Obama +Romney.
Use the operators OR or , to broaden your search when you'd like either of
multiple terms to appear in results. (This is the default behavior of our search when no operators
are used.) For example, search for democrat OR republican to find results that refer to
Democrats and/or Republicans.
Use NOT or - to subtract results from your search. For
example, searching Disney will yield results about the Walt Disney Company as well as Walt Disney
World Resort. To exclude mentions of Disney World, search for Disney -World or Disney
When using one of these operators with a phrase, enclose it in quotation marks. For example, you can
find results about smartphones excluding Apple's iPhone 4S by searching smartphone -"iPhone
Use parentheses to separate multiple
boolean phrases. For example, to find journalists talking about having fun in Disney World or
Disneyland, search for ("disney world" OR disneyland) AND fun.