Mystery grows over Capitol Police officer Brian Sicknick's death

Mystery is growing around police officer Brian Sicknick's death, as investigators struggle to prove it was caused by someone at the Capitol siege.

Mystery is growing around police officer Brian Sicknick's death, as investigators struggle to find evidence that it was caused by someone at the US Capitol siege on January 6. 

Authorities have reviewed video and photographs that show Mr Sicknick engaging with rioters as he defended the Capitol, but are yet to identify the moment he suffered his fatal injuries, law enforcement officials familiar with the matter told CNN. 

In a statement on January 7, the day after the insurrection, Capitol Police said that the officer had been "injured while physically engaging with protesters" and collapsed as a result of his injuries after returning to his office.

He died the next day in a local hospital. 

To date, little information has been shared publicly about the circumstances of his death, including any findings from an autopsy conducted by DC's medical examiner. 

It's largely been reported that the officer of 13 years was struck by a fire extinguisher and that's what caused his fatal injuries. 

Meanwhile, President Joe Biden has been accused of breaking one of his major campaign promises to offer $2000 relief cheques to American households.

In his proposed $US1.9 trillion coronavirus relief package, Joe Biden is pushing for direct payments of $1400 to American households, supplementing the $600 payments they got in the previous package a couple of months ago.

However, this is not what Mr Biden and the Democrats promised in the lead-up to the special Senate elections in Georgia. Democratic candidates Jon Ossoff and Raphael Warnock both campaigned on the promise that they would support $2000 payments.

The argument we're getting from the Democrats now is that they meant $2000 in total, counting the previous $600 cheques.

Read on for all the latest news from the US.