Armed police have swooped on a housing estate and ordered all residents to "stay inside".
Residents in Southcoates, Hull, have expressed their shock at the ongoing operation, understood to be in relation to a serious assault on Saturday night.
One told Hull Live said: "It is scary. The full street is cordoned off and armed police have turned up.
"We have been told to get inside our properties. I don't know what is happening.
Chief Superintendent Christine Wilson said: "Officers are in attendance at an ongoing operation on Durham Street, off Holderness Road in Hull in connection with a serious assault which occurred last night."
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A police helicopter was seen hovering over the area.
Some officers reportedly entered flats.
“Two police men have just walked in the entrance to the flats along with two men in normal clothing," one resident said.
"There is a lot of shouting from police and they are blocking the street off even more.”
The investigation continues.
