News | WorldUS capitol placed on lockdown after 'woman tries to enter with gun'Warning: The US capitol is on lockdown (file picture)Michael Reynolds/EPAHannah Al-Othman8 July 2016The US Capitol was put on lockdown after a woman reportedly tried to enter the building with a gun.Police in Washington have said an "event" was underway shortly after 9am, and authorities were hunting a person.A senate aide said that officers were looking for a woman who was "possibly armed" and who could be in the basement of the building.The Senate seargant at arms issued a lockdown alert for the building and visitor center, although office buildings remained open.One officer outside the Capitol said police were responding to "sketchy reports" of a woman who may have a gun. Read MoreWhite House and US Capitol building on lockdown after police officer is shotWashington DC on lockdown as amateur helicopter pilot lands on lawn in front of Capitol buildingUS Capitol placed on lockdown after man 'shoots himself dead on building's steps'The Senate sergeant at arms later said the lockdown had concluded. Police gave an all-clear notice to reopen the Capitol building shortly after 9.30am, about a half an hour after the lockdown began.It was not immediately clear whether the police had found the person they were seeking.MORE ABOUTWashington