New Delhi, May 15 -- United States President Donald Trump issued an order on Monday directing that all flags be lowered to half-staff on 15 May, Friday, across US, in observance of Peace Officers Memorial Day, according to US media reports. The day is dedicated to honouring law enforcement officers and remembering those who died in the line of duty.

US flags, along with adjacent flags such as state flags, are expected to be flown at half-staff from sunrise until sunset on Friday.

According to US Code, when lowering the flag, it should first hoist it "to the peak for an instant and then [lower it] to the half-staff position" Similarly, before it is fully lowered for the day, it must be "again raised to the peak before it is lowered for t...