An 88 year old woman and a 75 year old man have been tied up in two separate burglaries in Gainsborough.
The woman's home on Ropery Road was targeted first last night at around half past eight.
The thief stole 80 pounds in cash and her phone after restraining her.
He then targeted the man's house on Portland Terrace at around half past eleven.
The attacker threatened him with a knife to get his PIN number, before stealing his wallet and mobile.