CLEVELAND, Ohio – Local officials today will announce the

, according to the U.S. Attorney's Office.

(cleveland.com crime reporters Brandon Blackwell and Cory Shaffer and The Plain Dealer's James F. McCarty will be at the 3 p.m. news conference and in the neighborhoods where the arrests were made. Watch live streaming video, get updates and chat with them in the comments below.)

Steven Dettelbach, U.S. Attorney for the Northern District of Ohio, will join Cleveland Mayor Frank Jackson, Police Chief Michael McGrath and Cuyahoga County Prosecutor Tim McGinty to reveal details of the massive pre-dawn drug bust.

Officials say numerous arrests were made on Cleveland's East Side and in Euclid.

Heroin has become Cuyahoga County's most dangerous drug.

The narcotic killed 93 county residents during the first half of this year, keeping Cuyahoga on track to best last year's record-breaking toll: 161 users dead.

"One use of adulterated heroin, you can die," Dettelbach told cleveland.com in August. "If you use heroin that is too strong, you can die. If you leave rehab and use your old dose of heroin, you can die."

In 2012, Dettelbach's office seized more than 300 lbs. of heroin worth about $9.8 million -- nearly triple the weight seized the previous year, Dettelbach said.

Cuyahoga County executive Ed FitzGerald earlier this month called the region's heroin trend a "public health crisis."

"We are in the middle of something that is very alarming," he said.

Press conference video