We’ve found out more about the search that caught attention off Beach Drive last night, involving what looked like a law-enforcement boat searching for something or someone. While Seattle Police told us it wasn’t their boat, it turns out they were involved with the original call earlier in the day – tipster Mike spotted an auto-tweet categorized “water emergencies” in the long ongoing list of SPD “Tweets by Beat” on the WSB Crime Watch page. That gave us an incident number to ask SPD media liaison Det. Mark Jamieson about. He says police got a call around 3:40 pm from someone who described spotting a 10-foot metal rowboat with no one on board. Police decided to look from land. They saw no sign of anyone in distress, and turned the case over to the U.S. Coast Guard for further investigation – that’s whose vessel they say was out searching last night. The Coast Guard public-affairs officer we just called had no record of it, but in the meantime, the folks at Beach Drive Blog – which mentioned the search last night – points out the “rowboat” may have been the one shown on their site five days ago, since the tide’s been high enough to move things around.