SINGAPORE - A former security guard was placed on probation for 15 months on Thursday after he admitted having sex with a 13-year-old girl who had run away from home.

Muhammad Rohaizad Muhammad Razali, 20, is the third of four men to be dealt with for having sex with the minor, who fell pregnant and had to have an abortion.

He befriended her on Facebook and asked her to be his girlfriend. She agreed and they had sex six times over the next month at a HDB staircase landing.

He pleaded guilty to two of six offences committed between Feb 8 and March 8 and said he did not use protection on either occasion.

Muhammad Rohaiza was also ordered to perform 120 hours of community service and remain indoors between 10pm and 6am. His parents have to sign a $5,000 bond to ensure his good behaviour.

The court heard that during his month-long relationship with the girl, who is now 14, Muhammad Rohaizad would meet her almost every day near his home in Yishun. All of their sexual encounters took place in the staircase landing of a HDB block there.

Musa Ahmad, 23, and Muhammad Nur Hakim Abdullah, 21 - who were dealt with previously - each received a year in jail.

A fourth man, Muhammad Sharul Shah Saruwan, 20, will be sentenced on Dec 24.

The maximum penalty for having sex with a person under 16 is 10 years in jail and a fine.