UPDATE: I-43/94 SB reopened at National Avenue

Updated: 12:52 p.m. May 21, 2019

MILWAUKEE (CBS 58) -- All lanes of I-43/94 southbound at National Avenue have been reopened. 

The roadway was closed for about an hour and a half as deputies with the Milwaukee County Sheriff's Office searched for evidence. 

CBS 58 has reached out to the Milwaukee County Sheriff's Office for more information. 

Stay with CBS 58 on air and online for updates in this developing story. 

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Posted: 11:40 a.m. May 21, 2019

MILWAUKEE (CBS 58) -- All southbound lanes of I-43/94 at National Avenue are blocked due to police activity. 

I-43 SB near National lanes are blocked because of police activity. People are asked to get off at National and get back on at Holt. I’ll have a live report at 12 @CBS58pic.twitter.com/DN341vSK40

— Jacquelyn Abad (@JacquelynAbadTV) May 21, 2019

The Milwaukee County Sheriff's Office is investigating. The closure is expected to last over two hours. 

If possible, avoid the area. The alternate route is to exit at National Avenue and re-enter I-43/94 southbound at Holt Avenue.