A sex attacker who struck twice in two days after targeting women at night in Worcester has been jailed.

Dariusz Kocoj, who came to England from Poland in 2005, told his first victim they would be "good together" and groped her breasts and bottom.

She frantically began ringing the bells of residents in the block of flats where she lived in a bid to escape.

Kocoj left the scene but returned two days later and lay in wait, Worcester Crown Court heard today.

When he failed to see his intended victim, he grabbed the private parts of another woman from the same flats as she walked home with her boyfriend, said Wendy Miller, prosecuting.

Kocoj, aged 22, of Ombersley Road, Worcester, admitted two counts of sexual assault.

Judge Alistair McCreath concluded that he posed a significant risk to members of the public of serious harm.

A pre-sentence report assessed the defendant as predatory, obsessive and "driven by sexual desire regardless of the consequences".

Kocoj was given an indeterminate sentence for public protection. He must serve at least two years in jail and will only be released when the parole board considers him safe.

He will also be on licence for the rest of his life and must sign on the sex offenders' register for life.

The judge said Kocoj lacked insight into his crimes and had no victim empathy.

He added: "For both victims this was an experience that was humiliating and very frightening."

Kocoj saw the first victim walking near his home on April 15 around 11pm. She became terrified as he kissed her cheek and then fondled her body, said Miss Miller.

He pressed her hand onto his private parts before she managed to phone a friend and alert him to help her.

The victim wrote notes to other tenants in her block warning them about Kocoj.

Two days later she went to make a complaint to police while Kocoj spent over two hours lurking outside her flats.

When another tenant walked by, he pounced again but was confronted by the woman's boyfriend and fled.

Abigail Nixon, defending, said IT specialist Kocoj had no police record in Poland or the UK.

His behaviour was fuelled by excessive drinking and he had been "shocked to the core" by finding himself in court.

He was an educated man who came to this country to earn more money and gain financial stability, added Miss Nixon.