following up on vs following up

Some examples from the web:

• We already got a few leads we're following up on.
• Deputy Mayor, we're following up on various leads.
• I'm following up on a burglary that occurred some weeks ago.
• We're following up on a 911 call about a stabbing.
• I am following up on my story about crime in Central City.
• A detective is following up on an earlier investigation, yes.
• We've been following up on some leads related to a person of interest.
• I'm following up on things for the lawyer who's representing your grandma.
• Just say you're following up on something.
• I'm following up on a lead. I need to get to Owen Island.
• There could still be the killer out there, and far as we know, she was following up on a lead.
• No, look, she said she was following up on some lead about her mom.
• And two, you will ensure appropriate disciplinary action be taken by following up on all complaints.
• If Deeks was following up on his spinach clue, he was probably snooping around the food stores on the ship.
• We're following up on a lead and I will fill you in if and when we find something.
• I'm following up on a lead regarding the murder of Merrill Samus and his family.
• I am following up on a lead on corruption at the DWP.
• We have a few leads and several persons of interest we're following up on.
• A lead I was following up on didn't pan out the way I hoped it would.
• This is not a joke, Ariel. I'm following up on an important clue.

Some examples from the web:

• For longer phrases (4+ words) it's not always possible to find identical examples. Please try again with a shorter phrase.

  For the very best results, we recommend that you submit your full sentence to our Quick Text editing service so a human editor can provide you with the right suggestions.